qlcnic: Fix LRO disable

o In dev->open LRO was enabled by default, enable it depending
  upon netdev->features , kernel may have disabled it.
o Configure LRO when interface is up.

Signed-off-by: Rajesh Borundia <Rajesh.Borundia@qlogic.com>
Signed-off-by: Anirban Chakraborty <Anirban.Chakraborty@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>