drm/amd/pm: enable the fine grain tuning function for renoir

This patch is to enable the fine grain tuning function for renoir.

Signed-off-by: Xiaojian Du <Xiaojian.Du@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>