ARM: dts: rockchip: enable USB-OTG port on Radxa Rock2 Square

This allows the USB gadget framework to be used on Rock2 Square.
Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288-rock2-square.dts

@@ -321,3 +321,7 @@ &usb_host0_ehci {
 &usb_host1 {
 	status = "okay";
 };
+
+&usb_otg {
+	status = "okay";
+};