disk: sdmmc: runtime structure initialisation #156175

Job	Run time
twister-build-prep / prep_pr	3m 25s
twister-build-prep / prep_push	0s
twister-build (1)	26m 16s
twister-build (2)	27m 31s
twister-build (3)	24m 27s
twister-build (4)	30m 37s
twister-build (5)	20m 51s
twister-build (6)	20m 25s
twister-build (7)	23m 30s
Publish Unit Tests Results	10s
Check Twister Status / all jobs passed	1s
	2h 57m 13s

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