drm/amd/powerplay: support runtime ppfeatures setting on Navi10

Implement Navi10 backend for runtime ppfeatures status retrieving
and setting support.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>