drm/amdgpu: enable VCN DPG on Raven and Raven2

It's safe to enable dynamic VCN powergating on raven and
raven2 for increased power savings.

Reviewed-by: James Zhu <James.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed