dt-bindings: clock: add rk3588 cru bindings

Document the device tree bindings of the rockchip rk3588 SoC
clock and reset unit.

Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20221018151407.63395-4-sebastian.reichel@collabora.com


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