Revert "[Huawei] sched: export sched_setscheduler symbol"

Offering: HULK
hulk inclusion
category: feature
bugzilla: 55087 https://gitee.com/openeuler/kernel/issues/I4DDEL



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This reverts commit 5d7eabd898017e2bc2a767f085f314a3d7ce6542.
SEG determines that the sched_setscheduler interface is exported
by downstream users, hulk follows the community solution.

Signed-off-by: Zheng Zucheng <zhengzucheng@huawei.com>
Reviewed-by: Chen Hui <judy.chenhui@huawei.com>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>