arm64: dts: rockchip: enable dwc2-based otg controller on px30-evb

Enable the newly added controller on the px30 evaluation board.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/px30-evb.dts

@@ -206,6 +206,10 @@ &uart2 {
 	status = "okay";
 };
 
+&usb20_otg {
+	status = "okay";
+};
+
 &usb_host0_ehci {
 	status = "okay";
 };