memcg: Export memory.events and memory.events.local from cgroupv2 to cgroupv1

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4X0YD?from=project-issue


CVE: NA

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Export "memory.events" and "memory.events.local" from cgroupv2 to
cgroupv1.

There are some differences between v2 and v1:

1)events of MEMCG_OOM_GROUP_KILL is not included in cgroupv1. Because,
there is no member of memory.oom.group.

2)events of MEMCG_MAX is represented with "limit_in_bytes" in cgroupv1 instead
of memory.max

3)event of oom_kill is include in memory.oom_control. make oom_kill include
its descendants' events and add oom_kill_local include its oom_kill event only.

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