drm/amd/powerplay: simplified od_settings for each asic

the od_settings is asic related data, so move it to asic file.

Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>