sched: programmable: Add hook in can_migrate_task()

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



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Add hook of sched type in can_migrate_task(), as follows:
    'cfs_can_migrate_task'
     Decide whether the task can be migrated to dst_cpu.

Signed-off-by: Guan Jing <guanjing6@huawei.com>