Add missing RFC2544 Ethernet frame sizes

Add missing RFC2544 Ethernet frame sizes

RFC2544 tests should include the following frame sizes:

9.1 Frame sizes to be used on Ethernet

       64, 128, 256, 512, 1024, 1280, 1518

Change-Id: I6ab9cccf2bb3b2678f50da157a9a49c0d9564cbd
Signed-off-by: Dino Simeon Madarang <dinox.madarang@intel.com>
Reviewed-by: Alain Jebara <alain.jebara@intel.com>
Reviewed-by: Deepak S <deepak.s@linux.intel.com>
Reviewed-by: Ross Brattain <ross.b.brattain@intel.com>
Reviewed-by: Edward MacGillivray <edward.s.macgillivray@intel.com>