ascend: mm: add an owner for mm_struct

ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4EUVI


CVE: NA

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The mm->owner is only used for MEMCG currently, but the ascend share
pool features will use it later, so make it to a general features and
select it for CONFIG_MEMCG.

Signed-off-by: Tang Yizhou <tangyizhou@huawei.com>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>