Revert "mm/memory_hotplug: refrain from adding memory into an impossible node"

hulk inclusion
category: bugfix
bugzilla: 46857
CVE: NA

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This reverts commit 023faff7.

Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>