mm: move free_area_empty() to mm/internal.h

The free_area_empty() helper is only used inside mm/ so move it there to
reduce noise in include/linux/mmzone.h

Link: https://lkml.kernel.org/r/20230326160215.2674531-1-rppt@kernel.org


Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>