exynos: Enable mmc for snow

Snow has an internal eMMC and an external SD card. Enable these in the
device tree.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

board/samsung/dts/exynos5250-snow.dts

@@ -30,6 +30,10 @@
 		spi2 = "/spi@12d40000";
 		spi3 = "/spi@131a0000";
 		spi4 = "/spi@131b0000";
+		mmc0 = "/mmc@12200000";
+		mmc1 = "/mmc@12210000";
+		mmc2 = "/mmc@12220000";
+		mmc3 = "/mmc@12230000";
 	};
 
 	sound@12d60000 {
@@ -56,6 +60,26 @@
 		};
 	};
 
+	mmc@12200000 {
+		samsung,bus-width = <8>;
+		samsung,timing = <1 3 3>;
+		samsung,removable = <0>;
+	};
+
+	mmc@12210000 {
+		status = "disabled";
+	};
+
+	mmc@12220000 {
+		samsung,bus-width = <4>;
+		samsung,timing = <1 2 3>;
+		samsung,removable = <1>;
+	};
+
+	mmc@12230000 {
+		status = "disabled";
+	};
+
 	tmu@10060000 {
 		samsung,min-temp	= <25>;
 		samsung,max-temp	= <125>;