ARM: dts: imx6ul-14x14-evk: Move regulators out of simple-bus

It is not recommended to place regulator nodes inside simple-bus, so
move them out in order to fix the following build warnings with W=1:

arch/arm/boot/dts/imx6ul-14x14-evk.dtb: Warning (simple_bus_reg): Node /regulators/sd1_regulator missing or empty reg/ranges property
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6ul-14x14-evk.dts

@@ -30,19 +30,14 @@ backlight_display: backlight-display {
 		status = "okay";
 	};
 
-	regulators {
-		compatible = "simple-bus";
-		#address-cells = <1>;
-		#size-cells = <0>;
 
-		reg_sd1_vmmc: sd1_regulator {
-			compatible = "regulator-fixed";
-			regulator-name = "VSD_3V3";
-			regulator-min-microvolt = <3300000>;
-			regulator-max-microvolt = <3300000>;
-			gpio = <&gpio1 9 GPIO_ACTIVE_HIGH>;
-			enable-active-high;
-		};
+	reg_sd1_vmmc: regulator-sd1-vmmc {
+		compatible = "regulator-fixed";
+		regulator-name = "VSD_3V3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		gpio = <&gpio1 9 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
 	};
 
 	sound {