net: hns3: disable auto-negotiation off with 1000M setting in ethtool

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

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The 802.3 specification does not specify the behavior of
auto-negotiation off with 1000M in phy. Therefore, some phy
compatibility issues occur. This patch forbids the setting of
this unreasonable mode by ethtool in driver.

Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
Signed-off-by: shenhao <shenhao21@huawei.com>
Reviewed-by: Zhong Zhaohui <zhongzhaohui@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>