dt-bindings: soc: rockchip: add initial rk3588 syscon compatibles

Add IOC and PHP GRF syscon compatibles for RK3588.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20230109155801.51642-2-sebastian.reichel@collabora.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

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

@@ -20,6 +20,11 @@ properties:
               - rockchip,rk3568-pipe-grf
               - rockchip,rk3568-pipe-phy-grf
               - rockchip,rk3568-usb2phy-grf
+              - rockchip,rk3588-bigcore0-grf
+              - rockchip,rk3588-bigcore1-grf
+              - rockchip,rk3588-ioc
+              - rockchip,rk3588-php-grf
+              - rockchip,rk3588-sys-grf
               - rockchip,rk3588-pcie3-phy-grf
               - rockchip,rk3588-pcie3-pipe-grf
               - rockchip,rv1108-usbgrf