!1719 net: hns3: revert "net: hns3: disbable pfc en before the reset" and backport the mainline

Merge Pull Request from: @svishen 
 
This patch revert "net: hns3: disbable pfc en before the reset" and backport the mainline

issue:
https://gitee.com/openeuler/kernel/issues/I7S5M4 
 
Link:https://gitee.com/openeuler/kernel/pulls/1719

 

Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>