net: hns3: Add "mac table" information query function

driver inclusion
category: feature
bugzilla: NA
CVE: NA

This patch prints mac table information.

debugfs command:
echo dump mac tbl > cmd

Sample Command:
root@(none)# echo dump mac tbl > cmd

Signed-off-by: liuzhongzhu <liuzhongzhu@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Reviewed-by: Zhong Zhaohui <zhongzhaohui@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>