dpdk: tx/rx burst function description refactor
dpdk: tx/rx burst function description refactor

DPDK provides two new APIs to retrieve information about the Tx/Rx
packet burst mode:
rte_eth_tx_burst_mode_get
rte_eth_rx_burst_mode_get

This patch leverages these two APIs to describe the tx/rx mode.

Currently, Intel X710/E810 and Mellanox Mlx5 support the new APIs.
For NICs that don't support the new APIs, still use the original way
to print their tx/rx function name

Type: refactor

Signed-off-by: Chenmin Sun <71b642265be4af49e0dfaebb3693a304dd3a73e9@intel.com>
Change-Id: Ibe47f5debe3b3f17f462fbf9834394e22845cc08

chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp