net: hns3: adds debugfs to dump more info of shaping parameters

Adds debugfs to dump new shaping parameters: rate and flag.

Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>