dt-bindings: usb: dwc2: rockchip: add rockchip,rk3128-usb

Add rockchip,rk3128-usb compatible string.
Signed-off-by: NJohan Jonker <jbx6244@gmail.com>
Acked-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/dfb657ab-85e5-ac47-810d-133c7e8dd823@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/dwc2.yaml

@@ -32,6 +32,7 @@ properties:
           - enum:
               - rockchip,px30-usb
               - rockchip,rk3036-usb
+              - rockchip,rk3128-usb
               - rockchip,rk3188-usb
               - rockchip,rk3228-usb
               - rockchip,rk3288-usb