The 2nd parameter in __page_set_anon_rmap() is only used by
SetPageAnonExclusive(), so there is no need to put
SetPageAnonExclusive() in __page_set_anon_rmap().
Remove SetPageAnonExclusive() from __page_set_anon_rmap() and modify
__page_set_anon_rmap() to __folio_set_anon_rmap().
Since __page_check_anon_rmap() needs a folio, we can directly use
and change it to __folio_check_anon_rmap().