mm/pin_mem: add PG_hotreplace to mark pages need hotreplaced

euleros inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QPBH


CVE: NA

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Use PG_hotreplace flag to mark pin pages which need to be hotreplaced
to the recover process.

Signed-off-by: Jingxian He <hejingxian@huawei.com>
Reviewed-by: Kefeng <Wang&lt;wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>