dt-bindings: soc: rockchip: add rk3588 pipe-phy syscon

The pipe-phy syscon is used by rockchip,rk3588-naneng-combphy,
which in turn is the PHY for USB3, PCIe and SATA.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20230522173423.64691-2-sebastian.reichel@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: sre

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

@@ -24,6 +24,7 @@ properties:
               - rockchip,rk3588-bigcore1-grf
               - rockchip,rk3588-ioc
               - rockchip,rk3588-php-grf
+              - rockchip,rk3588-pipe-phy-grf
               - rockchip,rk3588-sys-grf
               - rockchip,rk3588-pcie3-phy-grf
               - rockchip,rk3588-pcie3-pipe-grf