dt-bindings: phy: rockchip-inno-usb2: add compatible for rk3308 USB phy

The RK3308 features a slightly different USB phy than other Rockchip SoCs.
This patch adds a compatible string for it.
Signed-off-by: Tobias Schramm <t.schramm@manjaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210514150044.2099298-2-t.schramm@manjaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.yaml

@@ -14,6 +14,7 @@ properties:
     enum:
       - rockchip,px30-usb2phy
       - rockchip,rk3228-usb2phy
+      - rockchip,rk3308-usb2phy
       - rockchip,rk3328-usb2phy
       - rockchip,rk3366-usb2phy
       - rockchip,rk3399-usb2phy