drm/amdgpu: clean doorbell after sending init table to mmsch
According to HW design, need to clean doorbell after setup MMSCH table. Signed-off-by: NFrank Min <Frank.Min@amd.com> Signed-off-by: NXiangliang Yu <Xiangliang.Yu@amd.com> Reviewed-by: NMonk Liu <Monk.Liu@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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