net/enic: flow API for NICs with advanced filters disabled

net/enic: flow API for NICs with advanced filters disabled

Flow support for 1300 series adapters with the 'Advanced Filter'
mode disabled via the UCS management interface. This allows:
Attributes: ingress
Items: Outer eth, ipv4, ipv6, udp, sctp, tcp, vxlan. Inner eth, ipv4,
       ipv6, udp, tcp.
Actions: queue and void
Selectors: 'is', 'spec' and 'mask'. 'last' is not supported

With advanced filters disabled, an IPv4 or IPv6 item must be specified
in the pattern.

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