powerpc: Convert sysfs cache code to of_find_next_cache_node()

Using the common code means that more complete cache information will
provided in sysfs on platforms that don't use the l2-cache property
convention.
Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/sysfs.c

@@ -566,7 +566,6 @@ static bool cache_is_unified(struct device_node *np)
 
 static struct cache_desc * __cpuinit create_cache_index_info(struct device_node *np, struct kobject *parent, int index, int level)
 {
-	const phandle *next_cache_phandle;
 	struct device_node *next_cache;
 	struct cache_desc *new, **end;
 
@@ -591,11 +590,7 @@ static struct cache_desc * __cpuinit create_cache_index_info(struct device_node
 	while (*end)
 		end = &(*end)->next;
 
-	next_cache_phandle = of_get_property(np, "l2-cache", NULL);
-	if (!next_cache_phandle)
-		goto out;
-
-	next_cache = of_find_node_by_phandle(*next_cache_phandle);
+	next_cache = of_find_next_cache_node(np);
 	if (!next_cache)
 		goto out;