be2net: Patch to determine if function is VF while running in guest OS.

When driver is loaded in guest OS, the pci variables is_virtfn and is_physfn are
both set to 0. This change uses registers in controller to determine the same.

Signed-off-by: Sarveshwar Bandi <sarveshwarb@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>