Ascend/memcg: Use CONFIG_ASCEND_FEATURES for customized interfaces

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


CVE: NA

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The following functions are used only in the ascend scenario:
hugetlb_get_hstate,
hugetlb_alloc_hugepage,
hugetlb_insert_hugepage_pte,
hugetlb_insert_hugepage_pte_by_pa

Remove unused interface hugetlb_insert_hugepage

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>