net: hns3: add interfaces to query information of tm priority/qset

Add some interfaces to get information of tm priority and qset,
then they can be used by debugfs.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>