ARM: dts: ls1021a: remove regulators simple-bus

There is no regulator bus in hardware.  So move the regulator nodes out
and remove the regulators simple-bus.  This also make the dts align with
the simple-bus schema.
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/ls1021a-qds.dts

@@ -25,20 +25,13 @@ sys_mclk: clock-mclk {
 		clock-frequency = <24576000>;
 	};
 
-	regulators {
-		compatible = "simple-bus";
-		#address-cells = <1>;
-		#size-cells = <0>;
-
-		reg_3p3v: regulator@0 {
+	reg_3p3v: regulator {
 		compatible = "regulator-fixed";
-			reg = <0>;
 		regulator-name = "3P3V";
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 		regulator-always-on;
 	};
-	};
 
 	sound {
 		compatible = "simple-audio-card";

arch/arm/boot/dts/ls1021a-twr.dts

@@ -23,20 +23,13 @@ sys_mclk: clock-mclk {
 		clock-frequency = <24576000>;
 	};
 
-	regulators {
-		compatible = "simple-bus";
-		#address-cells = <1>;
-		#size-cells = <0>;
-
-		reg_3p3v: regulator@0 {
+	reg_3p3v: regulator {
 		compatible = "regulator-fixed";
-			reg = <0>;
 		regulator-name = "3P3V";
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 		regulator-always-on;
 	};
-	};
 
 	sound {
 		compatible = "simple-audio-card";