dts:santaro:santoka: Set wp-gpio for SD-Cards

The "wp-gpios" assignment was missing for both platforms.

BCS 746-001170

arch/arm/boot/dts/seconorth/imx6qdl-santaro.dtsi

@@ -364,3 +364,8 @@ &usb3503 {
 &usbh2 {
 	status = "disabled";
 };
+
+&usdhc2 {
+	wp-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
+	status = "okay";
+};

arch/arm/boot/dts/seconorth/imx6qdl-santoka.dtsi

@@ -378,3 +378,8 @@ &usbh2 {
 &usbh3 {
 	status = "disabled";
 };
+
+&usdhc2 {
+	wp-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
+	status = "okay";
+};