net: hns3: add statistics for PFC frames and MAC control frames

net: hns3: add statistics for PFC frames and MAC control frames

BugLink: https://bugs.launchpad.net/bugs/1819535
In the old firmware version, statistics acquisition of
PFC frames and MAC control frames is not supported.
Add command retrieves statistics for PFC frames and
MAC control frames from the firmware.

Signed-off-by: liuzhongzhu <liuzhongzhu@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit d174ea75c96a12287354af53dc17cb24f328f90a)
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>