net/enic: improve packet type identification

net/enic: improve packet type identification

- add l4 ptypes to the ones we report as supporting
- report/use RTE_PTYPE_L3_IPV4_EXT_UNKNOWN and
  RTE_PTYPE_L3_IPV6_EXT_UNKNOWN instead of RTE_PTYPE_L3_IPV4 and
  RTE_PTYPE_L3_IPV6 as vic can't distinguish between packets with
  extentions and those without extentions.
- correctly set the ptype bits set on packets that are both tcp/udp
  and a frag
- set RTE_PTYPE_L4_NONFRAG on ip packets we know are not udp, tcp,
  or fragments.

Fixes: 947d860c821f ("enic: improve Rx performance")

Signed-off-by: Nelson Escobar <neescoba@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>