net/iavf: support TCP/UDP flow item without input set

net/iavf: support TCP/UDP flow item without input set

This patch adds an input set refinement function to support outer
and inner TCP/UDP patterns without input set for flow director filter.

For example:
1. flow create 0 ingress pattern eth / ipv4 / udp / end
   actions rss queues 0 1 2 3 end / end
2. flow create 0 ingress pattern eth / ipv6 / tcp / end
   actions queue index 3 / end

This patch will refine the input set when it is empty and generate
a dummy proto type as input set in L3 header which is required
by the hardware.

Signed-off-by: Yuying Zhang <yuying.zhang@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>