clk: rockchip: rk3128: Drop CLK_NR_CLKS usage

In order to get rid of CLK_NR_CLKS and be able to drop it from the
bindings, use rockchip_clk_find_max_clk_id helper to find the highest
clock id.

Signed-off-by: Alex Bee <knaerzche@gmail.com>
Link: https://lore.kernel.org/r/20240606143401.32454-3-knaerzche@gmail.com


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