netdev-offload-dpdk: Pass L4 proto-id to match in the L3 rte_flow_item.

netdev-offload-dpdk: Pass L4 proto-id to match in the L3 rte_flow_item.

The offload layer clears the L4 protocol mask in the L3 item, when the
L4 item is passed for matching, as an optimization. This can be confusing
while parsing the headers in the PMD. Also, the datapath flow specifies
this field to be matched. This optimization is best left to the PMD.
This patch restores the code to pass the L4 protocol type in L3 match.

Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Acked-by: Eli Britstein <elibr@mellanox.com>
Tested-by: Emma Finn <emma.finn@intel.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>