Revert "sched/rt: Fix double enqueue caused by rt_effective_prio"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I3ZX4D


CVE: NA

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sched_change_qos_group() calls __setscheduler(), but this
function is removed by this commit, revert it temporarily.
This reverts commit dcfce1f0.

Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>