dm: simple-bus: Add support for livetree

Modify simple-bus to support livetree.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/simple-bus.c b/drivers/core/simple-bus.c
index a300217..14803e3 100644
--- a/drivers/core/simple-bus.c
+++ b/drivers/core/simple-bus.c
@@ -33,8 +33,7 @@
 	u32 cell[3];
 	int ret;
 
-	ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev), "ranges",
-				   cell, ARRAY_SIZE(cell));
+	ret = dev_read_u32_array(dev, "ranges", cell, ARRAY_SIZE(cell));
 	if (!ret) {
 		struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);