dm: core: precise comments for get/find device by name

The functions:
- uclass_find_device_by_name()
- uclass_get_device_by_name()
searches the required device for the exactly given name.
This patch, presice this fact for both function's comments.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>

include/dm/uclass-internal.h

@@ -63,7 +63,7 @@ int uclass_find_next_device(struct udevice **devp);
 /**
  * uclass_find_device_by_name() - Find uclass device based on ID and name
  *
- * This searches for a device with the given name.
+ * This searches for a device with the exactly given name.
  *
  * The device is NOT probed, it is merely returned.
  *

include/dm/uclass.h

@@ -132,7 +132,7 @@ int uclass_get_device(enum uclass_id id, int index, struct udevice **devp);
 /**
  * uclass_get_device_by_name() - Get a uclass device by it's name
  *
- * This searches the devices in the uclass for one with the given name.
+ * This searches the devices in the uclass for one with the exactly given name.
  *
  * The device is probed to activate it ready for use.
  *