VCN (Video Core Next) is the video encode/decode block.

Porting over the same functions from VCN1.0

v2: squash in updates (Alex)
Signed-off-by: NLeo Liu <leo.liu@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NJames Zhu <James.Zhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>