!3843 [OLK-6.6] export cgroup.stat from cgroupv2 to cgroupv1

Merge Pull Request from: @lujialin2 
 
Dying cgroups always exist in memory/io cgroup subsystems, which will affect the statistical result and kernel behavior. Therefore, export cgroup.stat from v2 to v1, which contains dying cgroup number and sub cgroup number. 
 
Link:https://gitee.com/openeuler/kernel/pulls/3843

 

Reviewed-by: Liu Chao <liuchao173@huawei.com>
Reviewed-by: Zhang Jianhua <chris.zjh@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>