net/hns3: support RSS

net/hns3: support RSS

This patch adds support for RSS of hns3 PMD driver. It included the
follow functions:
In file hns3_rss.c:
1) Set/query hash key, rss_hf by .rss_hash_update/.rss_hash_conf_get ops
   callback functions.
2) Set/query redirection table by .reta_update/.reta_query. ops callback
   functions.
3) Set/query hash algorithm by .filter_ctrl ops callback function when
   the 'filter_type' is RTE_ETH_FILTER_HASH.

In file hns3_flow.c:
1) Set hash key, rss_hf, redirection table and algorithm by .create ops
   callback function.
2) Disable RSS by .destroy or .flush ops callback function.
3) Check the effectiveness of the RSS's configuration by .validate ops
   callback function.

Signed-off-by: Hao Chen <chenhao164@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Chunsong Feng <fengchunsong@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>