drm/amd/pp: Save vf state in pp context

Store vf state in pp_context so we can
deprecate the cgs interface.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>