drm/amd/powerplay: enable some feature for baffin/ellesmere. (v2)

Sync up with internal updates.

v2: squash in:
drm/amd/powerplay: set revert flag for enable thermal protect.

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>