The athub pg features enabling should be indicated by pg_flags.
Reported-by: NLijo Lazar <Lijo.Lazar@amd.com>
Signed-off-by: NHuang Rui <ray.huang@amd.com>
Reviewed-by: NKenneth Feng <kenneth.feng@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>