drm/amdgpu/vcn: update header to support dec software ring
Add macro, structure and function prototype to support vcn dec software ring. Signed-off-by: James Zhu <James.Zhu@amd.com> Reviewed-by: Leo Liu <leo.liu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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