net/hns3: fix flow director lock

Currently, the fdir lock was used to protect concurrent access in
multiple processes, it has the following problems:
1) Lack of protection for fdir reset recover.
2) Only part of data is protected, eg. the filterlist is not protected.

We use the following scheme:
1) Del the fdir lock.
2) Add a flow lock and provides rte flow driver ops API-level
   protection.
3) Declare support RTE_ETH_DEV_FLOW_OPS_THREAD_SAFE.

Fixes: fcba820d9b9e ("net/hns3: support flow director")
Cc: stable@dpdk.org
Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>