ARM: dts: Mark eMMC as non-removable in exynos5250-snow-common

The eMMC is non-removable so mark it using the non-removable DT
property to avoid having to redetect it after a suspend/resume.

Also remove the card-detect-delay property that is not needed with
non-removable.
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Tested-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

arch/arm/boot/dts/exynos5250-snow-common.dtsi

@@ -520,8 +520,7 @@ &i2s0 {
 &mmc_0 {
 	status = "okay";
 	num-slots = <1>;
-	broken-cd;
-	card-detect-delay = <200>;
+	non-removable;
 	samsung,dw-mshc-ciu-div = <3>;
 	samsung,dw-mshc-sdr-timing = <2 3>;
 	samsung,dw-mshc-ddr-timing = <1 2>;