Remove unused defines and macros for RX_LRO.

Change-ID: I8ca6715edfa62b56837417a1c4ff68c2345dab6e
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Jim Young <jamesx.m.young@intel.com>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>