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All implementations that aren't no-ops just set a bit in the flags, and we
want to use the folio flags rather than the page flags for that.  Rename
it to arch_clear_hugetlb_flags() while we're touching it so nobody thinks
it's used for THP.

[willy@infradead.org: fix arm64 build]
  Link: https://lkml.kernel.org/r/ZgQvNKGdlDkwhQEX@casper.infradead.org
Link: https://lkml.kernel.org/r/20240326171045.410737-8-willy@infradead.org

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>