This patch resumes promisc mode and vlan filter status after
loopback test.

Fixes: 3b75c3df ("net: hns3: net: hns3: Add support for IFF_ALLMULTI flag")
Signed-off-by: NJian Shen <shenjian15@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>