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