Ascend/hugetlb:support alloc normal and buddy hugepage

ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4D63I


CVE: NA

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The current function hugetlb_alloc_hugepage implements the allocation
from static hugepages first. When the static hugepage is used up, it
attempts to apply for hugepages from buddy system. Two additional modes
are supported: static hugepages only and buddy hugepages only.

Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com>
Signed-off-by: Guo Mengqi <guomengqi3@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>