board: trats2: Enable device tree on Trats2

This patch add dwmmc emmc controller node on exynos4 and exynos4412 device tree.

Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Piotr Wilczek <p.wilczek@samsung.com>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: Piotr Wilczek <p.wilczek@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/dts/exynos4412-trats2.dts b/arch/arm/dts/exynos4412-trats2.dts
index 1596f83..5269ae6 100644
--- a/arch/arm/dts/exynos4412-trats2.dts
+++ b/arch/arm/dts/exynos4412-trats2.dts
@@ -31,6 +31,7 @@
 		console = "/serial@13820000";
 		mmc0 = "sdhci@12510000";
 		mmc2 = "sdhci@12530000";
+		mmc4 = "dwmmc@12550000";
 	};
 
 	i2c@138d0000 {
@@ -431,4 +432,11 @@
 	sdhci@12540000 {
 		status = "disabled";
 	};
+
+	dwmmc@12550000 {
+		samsung,bus-width = <8>;
+		samsung,timing = <0 1 0>;
+		pwr-gpios = <&gpio 0xB2 0>;
+		index = <4>;
+	};
 };