bnx2x: Memory leak during VF removal

When removing a VF interface, the driver fails to release that VF's mailbox
and bulletin board allocated memory.

Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: Ariel Elior <Ariel.Elior@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>