[POWERPC] Fix vmemmap warning in init_64.c

Use the right printk format to silence the following warning.

  CC      arch/powerpc/mm/init_64.o
arch/powerpc/mm/init_64.c: In function 'vmemmap_populate':
arch/powerpc/mm/init_64.c:243: warning: format '%p' expects type 'void *', but argument 4 has type 'long unsigned int'
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/mm/init_64.c

@@ -240,7 +240,7 @@ int __meminit vmemmap_populate(struct page *start_page,
 			return -ENOMEM;
 
 		printk(KERN_WARNING "vmemmap %08lx allocated at %p, "
-					"physical %p.\n", start, p, __pa(p));
+		                    "physical %08lx.\n", start, p, __pa(p));
 
 		mapped = htab_bolt_mapping(start, start + page_size,
 					__pa(p), mode_rw, mmu_linear_psize,