dt-bindings: soc: rockchip: grf: add rockchip,rk3128-grf

Add rockchip,rk3128-grf compatible string.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/fddc23ff-0c87-4998-1bdf-4dbfa4c74046@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/soc/rockchip/grf.yaml

@@ -31,6 +31,7 @@ properties:
               - rockchip,px30-usb2phy-grf
               - rockchip,rk3036-grf
               - rockchip,rk3066-grf
+              - rockchip,rk3128-grf
               - rockchip,rk3188-grf
               - rockchip,rk3228-grf
               - rockchip,rk3288-grf
@@ -183,6 +184,7 @@ allOf:
           contains:
             enum:
               - rockchip,px30-usb2phy-grf
+              - rockchip,rk3128-grf
               - rockchip,rk3228-grf
               - rockchip,rk3308-usb2phy-grf
               - rockchip,rk3328-usb2phy-grf