ExchageContext: remove unused flag

[kghost]

Problem

Some legacy code is not being used at all

Change overview

Clear up unused code

Testing

Passed unit-tests

[github-actions]

PR #17661: Size comparison from 73579c9 to ca420b5

Increases (2 builds for cc13x2_26x2)

platform	target	config	section	73579c9	ca420b5	change	% change
cc13x2_26x2	all-clusters-app	LP_CC2652R7	(read/write)	161952	161960	8	0.0
	lock-ftd	LP_CC2652R7	(read/write)	166548	166564	16	0.0

Decreases (22 builds for cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, nrfconnect, p6, telink)

platform	target	config	section	73579c9	ca420b5	change	% change
cc13x2_26x2	all-clusters-app	LP_CC2652R7	(read only)	690975	690967	-8	-0.0
			.text	584480	584472	-8	-0.0
	lock-ftd	LP_CC2652R7	(read only)	677347	677331	-16	-0.0
			.text	578076	578060	-16	-0.0
	lock-mtd	LP_CC2652R7	(read only)	626099	626083	-16	-0.0
			.text	526940	526924	-16	-0.0
	pump-app	LP_CC2652R7	(read only)	649863	649847	-16	-0.0
			.text	573744	573728	-16	-0.0
	pump-controller-app	LP_CC2652R7	(read only)	642851	642835	-16	-0.0
			.text	563592	563576	-16	-0.0
cyw30739	light	cyw930739m2evb_01	(read/write)	618134	618118	-16	-0.0
			.app_xip_area	525140	525124	-16	-0.0
	lock	cyw930739m2evb_01	(read/write)	613082	613066	-16	-0.0
			.app_xip_area	521568	521552	-16	-0.0
	ota-requestor-no-progress-logging	cyw930739m2evb_01	(read/write)	565726	565710	-16	-0.0
			.app_xip_area	464624	464608	-16	-0.0
efr32	lighting-app	BRD4161A	(read only)	905880	905848	-32	-0.0
			.text	905872	905840	-32	-0.0
		BRD4161A+rpc	(read only)	940296	940264	-32	-0.0
			.text	940288	940256	-32	-0.0
	window-app	BRD4161A	(read only)	843352	843320	-32	-0.0
			.text	843344	843312	-32	-0.0
esp32	all-clusters-app	c3devkit	(read only)	997990	997972	-18	-0.0
			.flash.text	997990	997972	-18	-0.0
		m5stack	(read only)	1052195	1052155	-40	-0.0
			.flash.text	1046811	1046771	-40	-0.0
k32w	light	k32w061+release	(read/write)	684128	684112	-16	-0.0
			.text	598672	598656	-16	-0.0
	lock	k32w061+release	(read/write)	725220	725204	-16	-0.0
			.text	639172	639156	-16	-0.0
linux	chip-tool-no-interactive-ipv6only	arm64	(read only)	10549900	10549724	-176	-0.0
			.text	8911188	8911012	-176	-0.0
	thermostat-no-ble	arm64	(read only)	2361436	2361276	-160	-0.0
			.text	1987232	1987072	-160	-0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	text	805664	805652	-12	-0.0
p6	all-clusters-app	default	(read/write)	2525168	2525136	-32	-0.0
			.text	1483432	1483400	-32	-0.0
	light-app	default	(read/write)	2416936	2416904	-32	-0.0
			.text	1375200	1375168	-32	-0.0
	lock-app	default	(read/write)	2421112	2421080	-32	-0.0
			.text	1379376	1379344	-32	-0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	801048	801032	-16	-0.0
			text	570394	570376	-18	-0.0

Full report (23 builds for cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)

platform	target	config	section	73579c9	ca420b5	change	% change
cc13x2_26x2	all-clusters-app	LP_CC2652R7	(read only)	690975	690967	-8	-0.0
			(read/write)	161952	161960	8	0.0
			.bss	75912	75912	0	0.0
			.data	3396	3396	0	0.0
			.rodata	106015	106015	0	0.0
			.text	584480	584472	-8	-0.0
	lock-ftd	LP_CC2652R7	(read only)	677347	677331	-16	-0.0
			(read/write)	166548	166564	16	0.0
			.bss	73936	73936	0	0.0
			.data	3220	3220	0	0.0
			.rodata	98787	98787	0	0.0
			.text	578076	578060	-16	-0.0
	lock-mtd	LP_CC2652R7	(read only)	626099	626083	-16	-0.0
			(read/write)	146732	146732	0	0.0
			.bss	69656	69656	0	0.0
			.data	3220	3220	0	0.0
			.rodata	98667	98667	0	0.0
			.text	526940	526924	-16	-0.0
	pump-app	LP_CC2652R7	(read only)	649863	649847	-16	-0.0
			(read/write)	152532	152532	0	0.0
			.bss	74400	74400	0	0.0
			.data	3252	3252	0	0.0
			.rodata	75631	75631	0	0.0
			.text	573744	573728	-16	-0.0
	pump-controller-app	LP_CC2652R7	(read only)	642851	642835	-16	-0.0
			(read/write)	151944	151944	0	0.0
			.bss	74104	74104	0	0.0
			.data	3216	3216	0	0.0
			.rodata	78771	78771	0	0.0
			.text	563592	563576	-16	-0.0
cyw30739	light	cyw930739m2evb_01	(read/write)	618134	618118	-16	-0.0
			.app_xip_area	525140	525124	-16	-0.0
			.bss	75652	75652	0	0.0
			.data	692	692	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	lock	cyw930739m2evb_01	(read/write)	613082	613066	-16	-0.0
			.app_xip_area	521568	521552	-16	-0.0
			.bss	74204	74204	0	0.0
			.data	656	656	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	ota-requestor-no-progress-logging	cyw930739m2evb_01	(read/write)	565726	565710	-16	-0.0
			.app_xip_area	464624	464608	-16	-0.0
			.bss	83496	83496	0	0.0
			.data	568	568	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
efr32	lighting-app	BRD4161A	(read only)	905880	905848	-32	-0.0
			(read/write)	129392	129392	0	0.0
			.bss	127344	127344	0	0.0
			.data	2044	2044	0	0.0
			.text	905872	905840	-32	-0.0
		BRD4161A+rpc	(read only)	940296	940264	-32	-0.0
			(read/write)	146072	146072	0	0.0
			.bss	143824	143824	0	0.0
			.data	2248	2248	0	0.0
			.text	940288	940256	-32	-0.0
	window-app	BRD4161A	(read only)	843352	843320	-32	-0.0
			(read/write)	127480	127480	0	0.0
			.bss	125520	125520	0	0.0
			.data	1956	1956	0	0.0
			.text	843344	843312	-32	-0.0
esp32	all-clusters-app	c3devkit	(read only)	997990	997972	-18	-0.0
			(read/write)	1468074	1468074	0	0.0
			.dram0.bss	62640	62640	0	0.0
			.dram0.data	14428	14428	0	0.0
			.flash.rodata	206560	206560	0	0.0
			.flash.text	997990	997972	-18	-0.0
			.iram0.text	62020	62020	0	0.0
		m5stack	(read only)	1052195	1052155	-40	-0.0
			(read/write)	470080	470080	0	0.0
			.dram0.bss	68160	68160	0	0.0
			.dram0.data	34168	34168	0	0.0
			.flash.rodata	235916	235916	0	0.0
			.flash.text	1046811	1046771	-40	-0.0
			.iram0.text	123107	123107	0	0.0
k32w	light	k32w061+release	(read/write)	684128	684112	-16	-0.0
			.bss	77656	77656	0	0.0
			.data	2000	2000	0	0.0
			.text	598672	598656	-16	-0.0
	lock	k32w061+release	(read/write)	725220	725204	-16	-0.0
			.bss	78288	78288	0	0.0
			.data	1960	1960	0	0.0
			.text	639172	639156	-16	-0.0
linux	chip-tool-no-interactive-ipv6only	arm64	(read only)	10549900	10549724	-176	-0.0
			(read/write)	497633	497633	0	0.0
			.bss	40865	40865	0	0.0
			.data	1192	1192	0	0.0
			.data.rel.ro	393088	393088	0	0.0
			.dynamic	560	560	0	0.0
			.got	58680	58680	0	0.0
			.init	24	24	0	0.0
			.init_array	184	184	0	0.0
			.rodata	521052	521052	0	0.0
			.text	8911188	8911012	-176	-0.0
	thermostat-no-ble	arm64	(read only)	2361436	2361276	-160	-0.0
			(read/write)	151137	151137	0	0.0
			.bss	62897	62897	0	0.0
			.data	1488	1488	0	0.0
			.data.rel.ro	78992	78992	0	0.0
			.dynamic	560	560	0	0.0
			.got	4744	4744	0	0.0
			.init	24	24	0	0.0
			.init_array	368	368	0	0.0
			.rodata	145164	145164	0	0.0
			.text	1987232	1987072	-160	-0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2410108	2410108	0	0.0
			.bss	184996	184996	0	0.0
			.data	5848	5848	0	0.0
			.text	1372708	1372708	0	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1170627	1170627	0	0.0
			bss	136264	136264	0	0.0
			rodata	150052	150052	0	0.0
			text	805664	805652	-12	-0.0
p6	all-clusters-app	default	(read/write)	2525168	2525136	-32	-0.0
			.bss	118376	118376	0	0.0
			.data	2784	2784	0	0.0
			.text	1483432	1483400	-32	-0.0
	light-app	default	(read/write)	2416936	2416904	-32	-0.0
			.bss	111856	111856	0	0.0
			.data	2584	2584	0	0.0
			.text	1375200	1375168	-32	-0.0
	lock-app	default	(read/write)	2421112	2421080	-32	-0.0
			.bss	111656	111656	0	0.0
			.data	2544	2544	0	0.0
			.text	1379376	1379344	-32	-0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	801048	801032	-16	-0.0
			bss	69696	69696	0	0.0
			noinit	40416	40416	0	0.0
			text	570394	570376	-18	-0.0