MIPS: lantiq: unbreak devicetree init

The bootmem was incorrectly freed resulting in lots of dangling pointers.
Additionally we should use of_platform_populate() as the Documentaion tells us
to do so.
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4518

arch/mips/lantiq/prom.c

@@ -87,9 +87,6 @@ void __init device_tree_init(void)
 	reserve_bootmem(base, size, BOOTMEM_DEFAULT);
 
 	unflatten_device_tree();
-
-	/* free the space reserved for the dt blob */
-	free_bootmem(base, size);
 }
 
 void __init prom_init(void)
@@ -119,7 +116,7 @@ int __init plat_of_setup(void)
 		sizeof(of_ids[0].compatible));
 	strncpy(of_ids[1].compatible, "simple-bus",
 		sizeof(of_ids[1].compatible));
-	return of_platform_bus_probe(NULL, of_ids, NULL);
+	return of_platform_populate(NULL, of_ids, NULL, NULL);
 }
 
 arch_initcall(plat_of_setup);