drm/amd/pp: Disable dpm features on smu7/8 when suspend

Need to disable dpm features before halt rlc.

Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>