drm/amd/pp: Implement voltage regulator config on CI

Store the voltage regulator configuration
so we can properly query the voltage

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>