Revert "cgroup: Add missing cpus_read_lock() to cgroup_attach_task_all()"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6TI3Y


CVE: NA

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This reverts commit c2d83556.

Signed-off-by: Cai Xinchen <caixinchen1@huawei.com>
Reviewed-by: Wang Weiyang <wangweiyang2@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>