ARM: dts: Add vmmc regulator support for Arndale board

Added vmmc regulator node to Arndale DT file.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5250-arndale.dts

@@ -322,6 +322,7 @@ dwmmc_0: dwmmc0@12200000 {
 		samsung,dw-mshc-ciu-div = <3>;
 		samsung,dw-mshc-sdr-timing = <2 3>;
 		samsung,dw-mshc-ddr-timing = <1 2>;
+		vmmc-supply = <&mmc_reg>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&sd0_clk &sd0_cmd &sd0_bus4 &sd0_bus8>;
 
@@ -343,6 +344,7 @@ dwmmc_2: dwmmc2@12220000 {
 		samsung,dw-mshc-ciu-div = <3>;
 		samsung,dw-mshc-sdr-timing = <2 3>;
 		samsung,dw-mshc-ddr-timing = <1 2>;
+		vmmc-supply = <&mmc_reg>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_cd &sd2_bus4>;
 
@@ -415,6 +417,15 @@ wakeup {
 		};
 	};
 
+	mmc_reg: voltage-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "VDD_33ON_2.8V";
+		regulator-min-microvolt = <2800000>;
+		regulator-max-microvolt = <2800000>;
+		gpio = <&gpx1 1 1>;
+		enable-active-high;
+	};
+
 	fixed-rate-clocks {
 		xxti {
 			compatible = "samsung,clock-xxti";