mm/huge_memory: convert get_deferred_split_queue() to take a folio

Removes a few calls to compound_head().

Link: https://lkml.kernel.org/r/20230111142915.1001531-27-willy@infradead.org


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>