drm/amd/powerplay: enable avfs feature for polaris

avfs feature is for voltage control based on
gpu system clock on polaris10

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