net/hns3: add RSS hash offload to capabilities

net/hns3: add RSS hash offload to capabilities

Currently, when upper application calls rte_eth_dev_info_get API
function to query the Rx offload capability based on hns3 network
engine, RSS hash offload capacity is missing.

This patch fixes it by adding the related capacity in the
'.dev_infos_get' ops implementation function named hns3_dev_infos_get
and hns3vf_dev_infos_get for hns3 PF/VF PMD driver.

Fixes: c37ca66f2b27 ("net/hns3: support RSS")
Cc: stable@dpdk.org
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>