qlcnic: Loopback Inter Driver Communication AEN handler

o Loopback initiator function drivers should process loopback time extend AEN.
  These AENs are triggered by the loopback time extend mailbox command
  issued by the target function drivers.

Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>