dm: core: Improve comments for uclass_first/next_device()

Mention that the devices are probed ready for use.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index f6ec6d7..2577ae6 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -141,6 +141,8 @@
 /**
  * uclass_first_device() - Get the first device in a uclass
  *
+ * The device returned is probed if necessary, and ready for use
+ *
  * @id: Uclass ID to look up
  * @devp: Returns pointer to the first device in that uclass, or NULL if none
  * @return 0 if OK (found or not found), -1 on error
@@ -150,6 +152,8 @@
 /**
  * uclass_next_device() - Get the next device in a uclass
  *
+ * The device returned is probed if necessary, and ready for use
+ *
  * @devp: On entry, pointer to device to lookup. On exit, returns pointer
  * to the next device in the same uclass, or NULL if none
  * @return 0 if OK (found or not found), -1 on error