ARM: dts: s5pv210: move fixed regulators under root node in Aquila

The fixed regulators are kept under dedicated "regulators" node but this
causes multiple dtschema warnings:

  regulators: $nodename:0: 'regulators' does not match '^([a-z][a-z0-9\\-]+-bus|bus|soc|axi|ahb|apb)(@[0-9a-f]+)?$'
  regulators: #size-cells:0:0: 0 is not one of [1, 2]
  regulators: fixed-regulator@0:reg:0: [0] is too short
  regulators: fixed-regulator@1:reg:0: [1] is too short
  regulators: fixed-regulator@2:reg:0: [2] is too short

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200907161141.31034-21-krzk@kernel.org

arch/arm/boot/dts/s5pv210-aquila.dts

@@ -40,36 +40,27 @@
 		clock-frequency = <32768>;
 	};
 
-	regulators {
-		compatible = "simple-bus";
-		#address-cells = <1>;
-		#size-cells = <0>;
+	vtf_reg: regulator-0 {
+		compatible = "regulator-fixed";
+		regulator-name = "V_TF_2.8V";
+		regulator-min-microvolt = <2800000>;
+		regulator-max-microvolt = <2800000>;
+		gpio = <&mp05 4 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
 
-		vtf_reg: fixed-regulator@0 {
-			compatible = "regulator-fixed";
-			reg = <0>;
-			regulator-name = "V_TF_2.8V";
-			regulator-min-microvolt = <2800000>;
-			regulator-max-microvolt = <2800000>;
-			gpio = <&mp05 4 GPIO_ACTIVE_HIGH>;
-			enable-active-high;
-		};
+	pda_reg: regulator-1 {
+		compatible = "regulator-fixed";
+		regulator-name = "VCC_1.8V_PDA";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+	};
 
-		pda_reg: fixed-regulator@1 {
-			compatible = "regulator-fixed";
-			regulator-name = "VCC_1.8V_PDA";
-			regulator-min-microvolt = <1800000>;
-			regulator-max-microvolt = <1800000>;
-			reg = <1>;
-		};
-
-		bat_reg: fixed-regulator@2 {
-			compatible = "regulator-fixed";
-			regulator-name = "V_BAT";
-			regulator-min-microvolt = <3700000>;
-			regulator-max-microvolt = <3700000>;
-			reg = <2>;
-		};
+	bat_reg: regulator-2 {
+		compatible = "regulator-fixed";
+		regulator-name = "V_BAT";
+		regulator-min-microvolt = <3700000>;
+		regulator-max-microvolt = <3700000>;
 	};
 
 	i2c_pmic: i2c-pmic {