sched: programmable: Add hook in select_task_rq_fair()

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8OIT1



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Add hook of sched type in select_task_rq_fair(), as follows:
'cfs_select_rq'
	Replace the original core selection policy or
	implement dynamic CPU affinity.

Signed-off-by: Chen Hui <judy.chenhui@huawei.com>
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Guan Jing <guanjing6@huawei.com>