arm64: tegra: Add VBUS supply for micro USB port on Jetson Nano

The VBUS supply for the micro USB port on Jetson Nano is derived from
the main system supply and always on. Describe in nevertheless to fix
warnings during boot.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts

@@ -541,6 +541,8 @@ usb2-0 {
 				mode = "peripheral";
 				usb-role-switch;
 
+				vbus-supply = <&vdd_5v0_usb>;
+
 				connector {
 					compatible = "gpio-usb-b-connector",
 						     "usb-b-connector";
@@ -843,4 +845,14 @@ avdd_io_edp_1v05: regulator@7 {
 
 		vin-supply = <&avdd_1v05_pll>;
 	};
+
+	vdd_5v0_usb: regulator@8 {
+		compatible = "regulator-fixed";
+
+		regulator-name = "VDD_5V_USB";
+		regulator-min-microvolt = <50000000>;
+		regulator-max-microvolt = <50000000>;
+
+		vin-supply = <&vdd_5v0_sys>;
+	};
 };