dm: Convert users from dm_scan_fdt_node() to dm_scan_fdt_dev()

This new function is more convenient for callers, and handles pre-relocation
situations automatically.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/simple-bus.c b/drivers/core/simple-bus.c
index 1a9c864..5c955da 100644
--- a/drivers/core/simple-bus.c
+++ b/drivers/core/simple-bus.c
@@ -6,7 +6,6 @@
 
 #include <common.h>
 #include <dm.h>
-#include <dm/root.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -41,7 +40,7 @@
 		plat->size = cell[2];
 	}
 
-	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
+	return dm_scan_fdt_dev(dev);
 }
 
 UCLASS_DRIVER(simple_bus) = {