net: hns3: add enabled TC numbers and DWRR weight info in debugfs

The actual enabled TC numbers and the DWRR weight of each
TC may be helpful for debugging, so adds them into debugfs.

Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>