hugetlb: clean up hugetlb_cma_reserve

hugetlb: clean up hugetlb_cma_reserve

Use more generic functions to deal with issues related to online nodes.
The changes will make the code simplified.

Link: https://lkml.kernel.org/r/20220413032915.251254-5-liupeng256@huawei.com
Signed-off-by: Peng Liu <liupeng256@huawei.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Liu Yuntao <liuyuntao10@huawei.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Zhenguo Yao <yaozhenguo1@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>