arm64: mm: pagemap: Export pbha bit0 info

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I96IZH



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Bit 57 is used Commit fb8e37f3 ("mm/pagemap: export uffd-wp protection
information"). Use bit 59 to improve future compatibility for pbha.

Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>