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MT8195 vdosys1 merge1 to merge4 have HW mute function.
Add MERGE additional mute property description.
Signed-off-by: Nancy.Lin <nancy.lin@mediatek.com>
Acked-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>