drm/amdgpu: add sdma 7.0 support for copy dcc buffer
1. Add dcc buffer flag for copy buffer 2. Add sdma 7.0 support copy dcc buffer Signed-off-by:Likun Gao <Likun.Gao@amd.com> Signed-off-by:
Frank Min <Frank.Min@amd.com> Reviewed-by:
Hawking Zhang <Hawking.Zhang@amd.com> Reviewed-by:
Alex Deucher <alexander.deucher@amd.com> Reviewed-by:
Christian König <christian.koenig@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com>
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