clk: mediatek: mt8195: Implement remove functions

Until now the mediatek clk driver library did not have any way to
unregister clks, and so none of the drivers implemented remove
functions.

Now that the library does have APIs to unregister clks, use them
to implement remove functions for the mt8195 clk drivers.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Miles Chen <miles.chen@mediatek.com>
Link: https://lore.kernel.org/r/20220208124034.414635-31-wenst@chromium.org


Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>