[DO NOT MERGE] arm: dts: sunxi: Pine-H64: Enable USB3

Not sure why this is not enabled in the mainline DT (which we have
synced recently)? Other H6 boards enable it, and this seems to just work
for me?
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

arch/arm/dts/sun50i-h6-pine-h64.dts

@@ -89,6 +89,10 @@
 	status = "okay";
 };
 
+&dwc3 {
+	status = "okay";
+};
+
 &ehci0 {
 	status = "okay";
 };
@@ -331,3 +335,7 @@
 	usb3_vbus-supply = <&reg_usb_vbus>;
 	status = "okay";
 };
+
+&usb3phy {
+	status = "okay";
+};