clk: mediatek: Migrate remaining clk_unregister_*() to clk_hw_unregister_*()

During the previous |struct clk| to |struct clk_hw| clk provider API
migration in commit 6f691a58 ("clk: mediatek: Switch to clk_hw
provider APIs"), a few clk_unregister_*() calls were missed.

Migrate the remaining ones to the |struct clk_hw| provider API, i.e.
change clk_unregister_*() to clk_hw_unregister_*().

Fixes: 6f691a58

 ("clk: mediatek: Switch to clk_hw provider APIs")
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220926102523.2367530-3-wenst@chromium.org


Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>