net: hns3: split function hclge_update_port_base_vlan_cfg()

Currently the function hclge_update_port_base_vlan_cfg() is a
bit long. Split it to several small functions, to improve the
readability.

Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>