clk: mediatek: clk-gate: Use regmap_{set/clear}_bits helpers

Appropriately change calls to regmap_update_bits() with regmap_set_bits()
and regmap_clear_bits() for improved readability.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220103143712.46675-2-angelogioacchino.delregno@collabora.com


Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>