sched/qos: Don't unthrottle cfs_rq when cfs_rq is throttled by qos

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I64OUS


CVE: NA

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When a cfs_rq throttled by qos, mark cfs_rq->throttled as 1,
and cfs bw will unthrottled this cfs_rq by mistake, it cause
a list_del_valid warning.
So add macro QOS_THROTTLED(=2), when a cfs_rq is throttled by
qos, we mark the cfs_rq->throttled as QOS_THROTTLED, will check
the value of cfs_rq->throttled before unthrottle a cfs_rq.

Signed-off-by: Zhang Qiao <zhangqiao22@huawei.com>
Reviewed-by: Chen Hui <judy.chenhui@huawei.com>
Reviewed-by: zheng zucheng <zhengzucheng@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>