drm/amd/display: Added Opp and Diags Interface for P to I

Signed-off-by: Arun Pandey <Arun.Pandey@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>