net/hns3: fix VLAN filter when setting promisucous mode

net/hns3: fix VLAN filter when setting promisucous mode

Currently, when upper level application call the API function named
rte_eth_dev_set_vlan_offload to configure the hardware vlan filter
offload and call the rte_eth_promiscuous_enable API to enable
promiscuous mode based on hns3 PF device, driver can't receive the
packets with a vlan tag which has not been added by calling the API
function named rte_eth_dev_vlan_filter.

This patch fixes it by disabling the vlan filter when setting the
promiscuous mode and enabling the vlan filter again after the
promiscuous mode are disabled.

Fixes: 19a3ca4c99cf ("net/hns3: add start/stop and configure operations")
Cc: stable@dpdk.org
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>