The rte_flow_item_eth and rte_flow_item_vlan items are refined.
The structs do not exactly represent the packet bits captured on the
wire anymore so add_*_header functions should use real header instead of
the using rte_flow_item_* struct.
Replace the rte_flow_item_* with the existing corresponding rte_*_hdr.
Fixes: 09315fc838 ("ethdev: add VLAN attributes to ethernet and VLAN items")
Signed-off-by: Xiaoyu Min <jackmin@nvidia.com>