filemap: remove __set_page_dirty()

All callers have been converted to use folios; remove this wrapper.

Link: https://lkml.kernel.org/r/20240327185447.1076689-1-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>