[PATCH v3 03/15] clk: mediatek: Add MT8186 topckgen clock support

[Miles Chen]

> Add MT8186 topckgen clock controller which provides muxes, dividers
> to handle variety clock selection in other IP blocks.
> 
> Signed-off-by: Chun-Jie Chen <chun-jie.chen at mediatek.com>
> Acked-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>

Reviewed-by: Miles Chen <miles.chen at mediatek.com>