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

hulk inclusion
category: bugfix
Bugzilla: 50424
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>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>