!8181 v3 cpu/hotplug: Don't offline the last non-isolated CPU

Merge Pull Request from: @ci-robot 
 
PR sync from: liwei <liwei728@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/75QNETKNH3S4HRMI2YG6QZ6L6GLTCPLL/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9RFL2 
 
Link:https://gitee.com/openeuler/kernel/pulls/8181

 

Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>