dt-bindings: soc: rockchip: add rk3588 USB3 syscon

RK3588 USB3 support requires the GRF for USB and USBDP PHY.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20240213163609.44930-3-sebastian.reichel@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: sre

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

@@ -29,6 +29,8 @@ properties:
               - rockchip,rk3588-sys-grf
               - rockchip,rk3588-pcie3-phy-grf
               - rockchip,rk3588-pcie3-pipe-grf
+              - rockchip,rk3588-usb-grf
+              - rockchip,rk3588-usbdpphy-grf
               - rockchip,rk3588-vo-grf
               - rockchip,rk3588-vop-grf
               - rockchip,rv1108-usbgrf