ixgbe: cleanup feature flags in ixgbe_probe

I'm removing NETIF_F_GRO from being initialed in the feature flags during
ixgbe_probe() bases on a comment from Michal Miroslaw
<mirq-linux@rere.qmqm.pl> that it is always set by network code now.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -7510,7 +7510,6 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
 			   NETIF_F_HW_VLAN_FILTER |
 			   NETIF_F_TSO |
 			   NETIF_F_TSO6 |
-			   NETIF_F_GRO |
 			   NETIF_F_RXHASH |
 			   NETIF_F_RXCSUM;