net: hns3: add support for querying advertised pause frame by ethtool ethx

net: hns3: add support for querying advertised pause frame by ethtool ethx

BugLink: http://bugs.launchpad.net/bugs/1756097
This patch adds support for querying advertised pause frame by using
ethtool command(ethtool ethx).

Fixes: 496d03e960ae ("net: hns3: Add Ethtool support to HNS3 driver")
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Fuyun Liang <liangfuyun1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit f34ffffdcf06c779ac1ee303bf198152f0841386)
Signed-off-by: Manoj Iyer <manoj.iyer@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>