powerpc: Move sparse_init() into initmem_init

We did part of sparse initialisation in setup_arch and part in
initmem_init. Put them together.

Signed-off-by: Anton Blanchard <anton@samba.org>
Tested-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/mm/mem.c

@@ -205,6 +205,7 @@ void __init initmem_init(void)
 
 	/* XXX need to clip this if using highmem? */
 	sparse_memory_present_with_active_regions(0);
+	sparse_init();
 }
 
 /* mark pages that don't exist as nosave */