net: hns3: add vlan offload config command

This patch adds vlan offload config commands, initializes
the rules of tx/rx vlan tag handle for hw.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>