ethdev: remove old flow director API

ethdev: remove old flow director API

Old flow director API have been replaced by rte_eth_dev_filter_ctrl
since release 2.0. And no driver in current code support these functions.
All the removed functions are listed below:
  - rte_eth_dev_fdir_add_perfect_filter;
  - rte_eth_dev_fdir_add_signature_filter;
  - rte_eth_dev_fdir_get_infos;
  - rte_eth_dev_fdir_remove_perfect_filter;
  - rte_eth_dev_fdir_remove_signature_filter;
  - rte_eth_dev_fdir_set_masks;
  - rte_eth_dev_fdir_update_perfect_filter;
  - rte_eth_dev_fdir_update_signature_filter;

The library version was already incremented in a previous patch.

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
[Thomas: fix mlx4 and update release notes]
Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>