drm/amd/powerplay: add allowed feature mask for navi10

add smu feature mask:
1.FEATURE_DPM_PREFETCHER_BIT
2.FEATURE_DPM_PREFETCHER_BIT
3.FEATURE_ATHUB_PG

Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>