ixgbe: Fix usage of second flags bitmap when using LRO/RSC

A second set of feature flag bits was added, and the hardware RSC engine
flags were moved there.  However, the code itself didn't make the move
completely to use the new bitmap.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Acked-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>