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mtk mutex is used by DRM and MDP driver, and its function is SoC-specific,
so move it to soc folder.
Signed-off-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Acked-by: Matthias Brugger <matthias.bgg@gmail.com>