From: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
Both build_all_zonelists() and page_alloc_init_cpuhp() must be called
after SMP setup is complete but before the page allocator is set up.
Still, they both are a part of memory management initialization, so move
them to mm_init().
Signed-off-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>