qlcnic: Disable admin tools interface for VF driver mode

Non privileged (VF) driver will not be able to carry out any of the FW update,
etc. operations. Disable the tools interface by not creating the sysfs nodes.

Signed-off-by: Anirban Chakraborty <anirban.chakraborty@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>