net: hns3: refine function hclge_dbg_dump_tm_pri()

To improve flexibility, simplicity and maintainability to dump info of
every element of tm priority, add a struct hclge_dbg_item array of tm
priority and fill string of every data according to this array.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>