sched: Access control for sysctl_update_load_latency

hulk inclusion
category: feature
bugzilla: 175551 https://gitee.com/openeuler/kernel/issues/I4DDEL



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Add access control for sysctl_update_load_latency

Signed-off-by: Yu Jiahua <yujiahua1@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>