!13944  net/sched: accept TCA_STAB only for root qdisc

Merge Pull Request from: @ci-robot 
 
PR sync from: Wang Liang <wangliang74@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/3ZH7BMWKGELAWN6FLTODU3PEANBAYYM6/ 
 
https://gitee.com/src-openeuler/kernel/issues/IAYRJQ 
 
Link:https://gitee.com/openeuler/kernel/pulls/13944 

Reviewed-by: Zhang Changzhong <zhangchangzhong@huawei.com> 
Reviewed-by: Li Nan <linan122@huawei.com> 
Signed-off-by: Li Nan <linan122@huawei.com>