dt-bindings: soc: rockchip: add rk3588 mipi dcphy syscon

RK3588 CSI and DSI support requires the GRF for DC-PHY.

Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Link: https://lore.kernel.org/r/20240506124632.3621378-1-heiko@sntech.de


Signed-off-by: Heiko Stuebner <heiko@sntech.de>