drm/amd/pm: fix the crash after runtime pm resume

Some features are still disabled after runtime pm resume. This can take
the hardware back.
Unlike other projects, this doesn't need pptable retransfer.

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>