net/iavf: support VF RSS flow rule with raw pattern

net/iavf: support VF RSS flow rule with raw pattern

Enable Protocol Agnostic Flow Offloading for RSS hash in VF. It supports
raw pattern flow rule creation in VF based on Parser Library feature. VF
parses the spec and mask input of raw pattern, and passes it to kernel
driver to create the flow rule. Current rte_flow raw API is utilized.

command example:
RSS hash for ipv4-src-dst:
flow create 0 ingress pattern raw pattern spec
00000000000000000000000008004500001400004000401000000000000000000000
pattern mask
0000000000000000000000000000000000000000000000000000ffffffffffffffff /
end actions rss queues end / end

Signed-off-by: Ting Xu <ting.xu@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>