mm/sharepool: Charge Buddy hugepage to memcg

ascend inclusion
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I67NC1


CVE: NA

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Charge Buddy hugepage to memcg when kmemcg is disabled. If kmemcg
is enabled, we can alse use kmemcg to charge buddy hugepages.

Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>