net: hns3: Mask the packet statistics query when NIC is down

net: hns3: Mask the packet statistics query when NIC is down

BugLink: http://bugs.launchpad.net/bugs/1756097
Update the HNS3_NIC_STATE_DOWN bit when NIC state changes.
When NIC is down, mask the packet statistics for querying
with ifconfig command. It's a common practice.

Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit b875cc379de4cb4bcc7e189998667286baf916b8)
Signed-off-by: Manoj Iyer <manoj.iyer@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>