cpuset: Introduce new interface for scheduler dynamic affinity

hulk inclusion
category: feature
bugzilla: 186575, https://gitee.com/openeuler/kernel/issues/I526XC



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Add 'prefer_cpus' sysfs and related interface in cgroup cpuset.

Signed-off-by: tanghui <tanghui20@huawei.com>
Signed-off-by: Zheng Zucheng <zhengzucheng@huawei.com>
Reviewed-by: Zhang Qiao <zhangqiao22@huawei.com>