net/iavf: refactor RSS

net/iavf: refactor RSS

Current RSS implementation is not easy to scale and maintain.
The patch refactor the code base on below design:

1. iavf_pattern_match_item->input_set_mask is the superset of
   ETH_RSS_xxx.
2. iavf_pattern_match_item->meta is the virtchnl_proto_hdrs template.
3. iavf_hash_parse_pattern will generate pattern hint.
4. iavf_hash_parse_action will refine the virtchnl_proto_hdrs base on
   pattern hint and ETH_RSS_xxx.
5. The refine process include
   1) refine field selector of l2, l3, l4.
   2) insert gtpu proto_hdr at the beginning base on pattern hint.
   3) refine field selector for gtpu header.

The patch reduce the code from 4000+ line to less than 1000.

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Jeff Guo <jia.guo@intel.com>