ARM: dts: Add fixed voltage regulators to smdk5420

Fixed voltage regulators required by audio codec added.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5420-smdk5420.dts

@@ -31,6 +31,39 @@ oscclk {
 		};
 	};
 
+	regulators {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		vdd: fixed-regulator@0 {
+			compatible = "regulator-fixed";
+			reg = <0>;
+			regulator-name = "vdd-supply";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+			regulator-always-on;
+		};
+
+		dbvdd: fixed-regulator@1 {
+			compatible = "regulator-fixed";
+			reg = <1>;
+			regulator-name = "dbvdd-supply";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			regulator-always-on;
+		};
+
+		spkvdd: fixed-regulator@2 {
+			compatible = "regulator-fixed";
+			reg = <2>;
+			regulator-name = "spkvdd-supply";
+			regulator-min-microvolt = <5000000>;
+			regulator-max-microvolt = <5000000>;
+			regulator-always-on;
+		};
+	};
+
 	rtc@101E0000 {
 		status = "okay";
 	};