clk: mediatek: Add mtk_clk_simple_probe() to simplify clock providers

clk: mediatek: Add mtk_clk_simple_probe() to simplify clock providers

Most of subsystem clock providers only need to register clock gates
in their probe() function.
To reduce the duplicated code by add a generic function.

Signed-off-by: Weiyi Lu <[email protected]>
Signed-off-by: Chun-Jie Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Ikjoon Jang <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>