!3563 memcg: support ksm merge any mode per cgroup

Merge Pull Request from: @ci-robot 
 
PR sync from: Nanyong Sun <sunnanyong@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/FDKL7SLYNCAHLMI65PLOSKQORXIJWYZR/ 
 
https://gitee.com/openeuler/kernel/issues/I8OIQR 
 
Link:https://gitee.com/openeuler/kernel/pulls/3563

 

Reviewed-by: Lu Jialin <lujialin4@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>