the amdgpu device attribute node will be created accordding to sriov vf
mode at runtime.
cleanup unnecessary sriov check in attribute operation function.
Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>