ARM: dts: imx6q-apalis-eval: add carrier board 3.3V supply

Add the 3.3V main supply on the carrier board. Currently as a fixed
supply since not all consumer are modeled yet. This gets also rid of
some missing supply warnings.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6q-apalis-eval.dts

@@ -113,6 +113,7 @@ panel: panel {
 		 */
 		compatible = "edt,et057090dhu";
 		backlight = <&backlight>;
+		power-supply = <&reg_3v3_sw>;
 
 		port {
 			lcd_panel_in: endpoint {
@@ -131,19 +132,30 @@ reg_pcie_switch: regulator-pcie-switch {
 		enable-active-high;
 		status = "okay";
 	};
+
+	reg_3v3_sw: regulator-3v3-sw {
+		compatible = "regulator-fixed";
+		regulator-name = "3.3V_SW";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
 };
 
 &backlight {
 	brightness-levels = <0 127 191 223 239 247 251 255>;
 	default-brightness-level = <1>;
+	power-supply = <&reg_3v3_sw>;
 	status = "okay";
 };
 
 &can1 {
+	xceiver-supply = <&reg_3v3_sw>;
 	status = "okay";
 };
 
 &can2 {
+	xceiver-supply = <&reg_3v3_sw>;
 	status = "okay";
 };