net/i40e: fix flow director initialisation

net/i40e: fix flow director initialisation

Remove references to struct rte_fdir_conf which is deprecated,
in i40e_flow_parse_fdir_filter(), i40e_flow_destroy() and
i40e_flow_add_del_fdir_filter().

Fixes: c3be43817cfb ("net/i40e: fix unexpected skip FDIR setup")
Fixes: 2e67a7fbf3ff ("net/i40e: config flow director automatically")
Fixes: 4149825bbdb9 ("net/i40e: finish integration FDIR with generic flow API")
Cc: stable@dpdk.org
Signed-off-by: Bernard Iremonger <bernard.iremonger@intel.com>
Acked-by: Beilei Xing <beilei.xing@intel.com>