net: hns: fix ping failed when setting "autoneg off speed 100 duplex half"

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

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When setting "autoneg off speed 100 duplex half", ping will
failed. This patch turn off the autoneg mode of mac to fix
the problem.

Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Reviewed-by: li yongxin <liyongxin1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>