drm/amd/sriov no need to config GECC for sriov

No need to config GECC feature here for sriov
Leave the host drvier to do the configuration job.

Signed-off-by: Jack Zhang <Jack.Zhang1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>