drm/amd/powerplay: move ppfeature mask setting to smu_cmn.c

Considering they are shared by all ASICs. And we are moving
to centralize all feature enablement/support checking and
setting APIs in smu_cmn.c.

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>