arm64/ascend: Add set hugepage number helper function

ascend inclusion
category: feature
bugzilla: NA
CVE: NA

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Add helper function for change system hugepage nr, and export it out.

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