arm64/ascend: Add mmap hook when alloc hugepage

ascend inclusion
category: feature
bugzilla: NA
CVE: NA

-------------------------------------------------

Use block notify chain to notify user that mmap event.

Signed-off-by: Weilong Chen <chenweilong@huawei.com>
Reviewed-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>