drm/amdgpu: remove FB location config for sriov

FB location is already programmed by HV driver
for arcutus so remove this part

Signed-off-by: Frank.Min <Frank.Min@amd.com>
Reviewed-by: Emily Deng <Emily.Deng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>