drm/amdgpu/runpm: disable runpm on Vega10

Some framework test will fail if enable runpm on Vega10.
Disable it untill issue fixed.

Signed-off-by: Feifei Xu <Feifei.Xu@amd.com>
Tested-by: Kyle Chen <Kyle.Chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>