MLK-10228 dts: imx6qdl-sabreauto: remove SDb WP pin which is not conn…

…ect by default

SDb WP pin is not connected by default on MX6Q CPU2 board, so we removed it
in DTS file. BTW, SDb slot is designed for WiFi slot, it is ok to disable WP
for old CPU board also.

Signed-off-by: Dong Aisheng <b29396@freescale.com>
(cherry picked from commit 2efa09eb28d7404933725bc25b528641a9dc10f9)
(cherry picked from commit dd6e28f2932284494c89bb4897ad84c01db969d8)

arch/arm/boot/dts/imx6qdl-sabreauto.dtsi

@@ -941,7 +941,6 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_usdhc1>;
 	cd-gpios = <&gpio1 1 0>;
-	wp-gpios = <&gpio5 20 0>;
 	no-1-8-v;
 	keep-power-in-suspend;
 	enable-sdio-wakeup;