mm,hwpoison: refactor soft_offline_huge_page and __soft_offline_page

mainline inclusion
from linux-v5.10-rc1
commit 6b9a217e
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4LE22


CVE: NA

--------------------------------

Merging soft_offline_huge_page and __soft_offline_page let us get rid of
quite some duplicated code, and makes the code much easier to follow.

Now, __soft_offline_page will handle both normal and hugetlb pages.

Signed-off-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>

Conflicts:
	mm/page_alloc.c
	mm/memory-failure.c

Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>