dm: replace auto_alloc_size with auto

The auto_alloc_size members of struct driver has been renamed auto.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dm/device.h b/include/dm/device.h
index f5b4cd6..e665558 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -111,7 +111,7 @@
  * probe method if the device has a device tree node.
  *
  * All three of plat, priv and uclass_priv can be allocated by the
- * driver, or you can use the auto_alloc_size members of struct driver and
+ * driver, or you can use the auto members of struct driver and
  * struct uclass_driver to have driver model do this automatically.
  *
  * @driver: The driver used by this device