Revert "mm/dynamic_hugetlb: disable dynamic hugetlb if hugetlb_vmemmap is enabled"

hulk inclusion
category: bugfix
bugzilla: 187198, https://gitee.com/openeuler/kernel/issues/I5GVFO


CVE: NA

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Will disable hugetlb_vmemmap when dynamic hugetlb is enabled in later patch.

This reverts commit c7ae7c0d.

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