ARM: dts: Put Arndale fixed voltage regulators on a simple-bus

Fixed voltage regulators (and other similar free standing things) are
supposed to go on a simple-bus for DT correctness reasons.
Signed-off-by: NMark Brown <broonie@linaro.org>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

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

@@ -432,6 +432,11 @@
 		vdd-supply = <&ldo8_reg>;
 	};
 
+	regulators {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
 		mmc_reg: voltage-regulator {
 			compatible = "regulator-fixed";
 			regulator-name = "VDD_33ON_2.8V";
@@ -445,6 +450,7 @@
 			compatible = "regulator-fixed";
 			regulator-name = "hdmi-en";
 		};
+	};
 
 	fixed-rate-clocks {
 		xxti {