igb: disable IPv6 extension header processing

Disable IPv6 extension header processing as per hardware errata.

Also fix copyright date.

Signed-off-by: Todd Fujinaka <todd.fujinaka@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --cc drivers/net/ethernet/intel/igb/e1000_82575.c
Simple merge

diff --cc drivers/net/ethernet/intel/igb/e1000_defines.h
Simple merge