Compatible with previous usage, because may network drivers are using old member name to print logs, and there's no significant need to change them now.
Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
Prepare for multiple IPv6 addresses per net device, then we can notify
add/remove of a single address later.
Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>