ARM: dts: imx6sl-evk: Assign corresponding power supply for LDOs

On i.MX6SL EVK board, sw2 supplies vdd1p1/vdd2p5/vdd3p0 LDO, this
patch assigns corresponding power supply for vdd1p1/vdd2p5/vdd3p0
to avoid confusion by below log:

vdd1p1: supplied by regulator-dummy
vdd3p0: supplied by regulator-dummy
vdd2p5: supplied by regulator-dummy

With this patch, the power supply is more accurate:

vdd1p1: supplied by SW2
vdd3p0: supplied by SW2
vdd2p5: supplied by SW2
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6sl-evk.dts

@@ -580,6 +580,18 @@ &pwm1 {
 	status = "okay";
 };
 
+&reg_vdd1p1 {
+	vin-supply = <&sw2_reg>;
+};
+
+&reg_vdd3p0 {
+	vin-supply = <&sw2_reg>;
+};
+
+&reg_vdd2p5 {
+	vin-supply = <&sw2_reg>;
+};
+
 &snvs_poweroff {
 	status = "okay";
 };

arch/arm/boot/dts/imx6sl.dtsi

@@ -531,7 +531,7 @@ anatop: anatop@20c8000 {
 					     <0 54 IRQ_TYPE_LEVEL_HIGH>,
 					     <0 127 IRQ_TYPE_LEVEL_HIGH>;
 
-				regulator-1p1 {
+				reg_vdd1p1: regulator-1p1 {
 					compatible = "fsl,anatop-regulator";
 					regulator-name = "vdd1p1";
 					regulator-min-microvolt = <1000000>;
@@ -546,7 +546,7 @@ regulator-1p1 {
 					anatop-enable-bit = <0>;
 				};
 
-				regulator-3p0 {
+				reg_vdd3p0: regulator-3p0 {
 					compatible = "fsl,anatop-regulator";
 					regulator-name = "vdd3p0";
 					regulator-min-microvolt = <2800000>;
@@ -561,7 +561,7 @@ regulator-3p0 {
 					anatop-enable-bit = <0>;
 				};
 
-				regulator-2p5 {
+				reg_vdd2p5: regulator-2p5 {
 					compatible = "fsl,anatop-regulator";
 					regulator-name = "vdd2p5";
 					regulator-min-microvolt = <2250000>;