qlcnic: Enable diagnostic test for multiple Tx queues.

o Enable diagnostic test via ethtool and QConvergeConsole
  application when Multiple Tx queues are enabled on 82xx
  series adapters.

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