[Why]
VSC infoframe is needed for PSR. Previously only DMCU controller
supported PSR. Now DMUB also implements PSR.

[How]
Remove VSC infoframe dependency on DMCU.
Signed-off-by: Roman Li <roman.li@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Eryk Brol <eryk.brol@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>