mm/huge_memory: disable THP when dynamic hugetlb is enabled

hulk inclusion
category: feature
bugzilla: 46904, https://gitee.com/openeuler/kernel/issues/I4QSHG


CVE: NA

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When THP is enabled, the allocation of a page(order=0) may be converted to
an allocation of pages(order>0). In this case, the allocation will skip the
dhugetlb_pool. When we want to use dynamic hugetlb feature, we have to
disable THP for now.

Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>