drm/amd/powerplay: refine powerplay code for CZ/ST

1. add function points instand of creat function tables
2. implement stop dpm tasks for CZ/ST

Reviewed-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>
2 files changed