drm/amd/powerplay: skip od feature on navi10 for the moment

OD feature isn't enabled on navi10 so skip it for the moment.

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