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>
diff --git a/include/configs/odroid.h b/include/configs/odroid.h
index 77fca32..7989fb2 100644
--- a/include/configs/odroid.h
+++ b/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>