net: hns3: adds a kernel message when restart autoneg.

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

----------------------------

When restart autoneg, the link will go down and up, adds a
kernel message to indicate this operation.

Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Reviewed-by: Yongxin Li <liyongxin1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>