clk: rockchip: add clock controller for rk3568

Add the clock tree definition for the new rk3568 SoC.

Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20210315085608.16010-5-zhangqing@rock-chips.com


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