dt-bindings: soc: rockchip: add naneng combo phy register compatible

Add Naneng combo phy register compatible.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Signed-off-by: Yifeng Zhao <yifeng.zhao@rock-chips.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220324120122.1339-1-jbx6244@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

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

@@ -15,6 +15,8 @@ properties:
       - items:
           - enum:
               - rockchip,rk3288-sgrf
+              - rockchip,rk3568-pipe-grf
+              - rockchip,rk3568-pipe-phy-grf
               - rockchip,rk3568-usb2phy-grf
               - rockchip,rv1108-usbgrf
           - const: syscon