app/testpmd: fix queue stats mapping configuration

app/testpmd: fix queue stats mapping configuration

Currently, the queue stats mapping has the following problems:
1) Many PMD drivers don't support queue stats mapping. But there is no
   failure message after executing the command "set stat_qmap rx 0 2 2".
2) Once queue mapping is set, unrelated and unmapped queues are also
   displayed.
3) The configuration result does not take effect or can not be queried
   in real time.
4) The mapping arrays, "tx_queue_stats_mappings_array" &
   "rx_queue_stats_mappings_array" are global and their sizes are based
   on fixed max port and queue size assumptions.
5) These record structures, 'map_port_queue_stats_mapping_registers()'
   and its sub functions are redundant for majority of drivers.
6) The display of the queue stats and queue stats mapping is mixed
   together.

Since xstats is used to obtain queue statistics, we have made the
following simplifications and adjustments:
1) If PMD requires and supports queue stats mapping, configure to driver
   in real time by calling ethdev API after executing the command "set
   stat_qmap rx/tx ...". If not, the command can not be accepted.
2) Based on the above adjustments, these record structures,
   'map_port_queue_stats_mapping_registers()' and its sub functions can
   be removed. "tx-queue-stats-mapping" & "rx-queue-stats-mapping"
   parameters, and 'parse_queue_stats_mapping_config()' can be removed
   too.
3) remove display of queue stats mapping in 'fwd_stats_display()' &
   'nic_stats_display()', and obtain queue stats by xstats.  Since the
   record structures are removed, 'nic_stats_mapping_display()' can be
   deleted.

Fixes: 4dccdc789bf4 ("app/testpmd: simplify handling of stats mappings error")
Fixes: 013af9b6b64f ("app/testpmd: various updates")
Fixes: ed30d9b691b2 ("app/testpmd: add stats per queue")
Cc: stable@dpdk.org
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>