cgroup: disable kernel memory accounting for all memory cgroups by default

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8QLND


CVE: NA

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The kernel memory accounting for all memory cgroups is
not stable, and it will cause a 100% regression in
hackbench compared with kernel-4.19, so disable it by
default. We can use the following command line to enable
or disable it:
cgroup.memory=kmem or cgroup.memory=kmem.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: chenridong <chenridong@huawei.com>