be2net: For the VF MAC, use the OUI from current MAC address

Currently we are always using the Emulex OUI for a VF MAC address
while generating MAC for a VF.  Use OUI from current MAC instead.

Signed-off-by: Ajit Khaparde <ajit.khaparde@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>