sched: Introduce dynamic affinity for cfs scheduler

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8LL9S



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Dynamic affinity set preferred cpus for task. When the utilization of
taskgroup's preferred cpu is low, task only run in cpus preferred to
enhance cpu resource locality and reduce interference between task cgroups,
otherwise task can burst preferred cpus to use external cpu within
cpus allowed.

Signed-off-by: Hui Tang <tanghui20@huawei.com>