Add required power supply for ov5640.

Fix below CHECK_DTBS warnings:
arch/arm/boot/dts/nxp/imx/imx6ul-14x14-evk.dtb: camera@3c (ovti,ov5640): 'AVDD-supply' is a required property
        from schema $id: http://devicetree.org/schemas/media/i2c/ovti,ov5640.yaml#

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 arch/arm/boot/dts/nxp/imx/imx6ul-14x14-evk.dtsi | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-14x14-evk.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-14x14-evk.dtsi
index 17989e6d82e6bef95d96cbdc3545eaebf648367d..73c9cfbdba621c1cf42f56ef2e9d31574c4f8311 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ul-14x14-evk.dtsi
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-14x14-evk.dtsi
@@ -22,6 +22,26 @@ backlight_display: backlight-display {
 		status = "okay";
 	};
 
+	reg_1v5: regulator-1v5 {
+		compatible = "regulator-fixed";
+		regulator-name = "1v5";
+		regulator-min-microvolt = <1500000>;
+		regulator-max-microvolt = <1500000>;
+	};
+
+	reg_1v8: regulator-1v8 {
+		compatible = "regulator-fixed";
+		regulator-name = "1v8";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+	};
+
+	reg_2v8: regulator-2v8 {
+		compatible = "regulator-fixed";
+		regulator-name = "2v8";
+		regulator-min-microvolt = <2800000>;
+		regulator-max-microvolt = <2800000>;
+	};
 
 	reg_sd1_vmmc: regulator-sd1-vmmc {
 		compatible = "regulator-fixed";
@@ -182,6 +202,9 @@ camera@3c {
 		clock-names = "xclk";
 		powerdown-gpios = <&gpio_spi 6 GPIO_ACTIVE_HIGH>;
 		reset-gpios = <&gpio_spi 5 GPIO_ACTIVE_LOW>;
+		AVDD-supply = <&reg_2v8>;
+		DVDD-supply = <&reg_1v5>;
+		DOVDD-supply = <&reg_1v8>;
 
 		port {
 			ov5640_to_parallel: endpoint {

-- 
2.34.1