arm64: dts: allwinner: orange-pi-3: Enable USB 3.0 host support

Enable Allwinner's USB 3.0 phy and the host controller. Orange Pi 3
board has GL3510 USB 3.0 4-port hub connected to the SoC's USB 3.0
port. All four ports are exposed via USB3-A connectors. VBUS is
always on, since it's powered directly from DCIN (VCC-5V) and
not switchable.

Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts

@@ -95,6 +95,10 @@
 	status = "okay";
 };
 
+&dwc3 {
+	status = "okay";
+};
+
 &ehci0 {
 	status = "okay";
 };
@@ -310,3 +314,7 @@
 	usb3_vbus-supply = <&reg_vcc5v>;
 	status = "okay";
 };
+
+&usb3phy {
+	status = "okay";
+};