arm: dts: exynos: Use common alias for Odroid U3/X2 MMC2 (SD-card)

Use MMC0 for eMMC and MMC2 for SD-card as other Exynos-based boards do.
This allows to use common code to get MMC device id based on the XOM[7:5]
pins.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/dts/exynos4412-odroid.dts

@@ -17,7 +17,7 @@
 		serial0 = "/serial@13800000";
 		console = "/serial@13810000";
 		mmc0 = &mshc_0;
-		mmc1 = &sdhci2;
+		mmc2 = &sdhci2;
 	};
 
 	serial@13810000 {

include/configs/odroid.h

@@ -80,7 +80,7 @@
 	"tzsw raw 0x83f 0x138\0"
 
 #define BOOT_TARGET_DEVICES(func) \
-	func(MMC, mmc, 1) \
+	func(MMC, mmc, 2) \
 	func(MMC, mmc, 0)
 
 #include <config_distro_bootcmd.h>