PM / devfreq: Reduce log severity for informative message

Suppose devfreq_update_status() failure in devfreq_set_target() is not a
critical error, reduces the log severity.
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/devfreq/devfreq.c

@@ -382,8 +382,8 @@ static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
 	devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
 
 	if (devfreq_update_status(devfreq, new_freq))
-		dev_err(&devfreq->dev,
-			"Couldn't update frequency transition information.\n");
+		dev_warn(&devfreq->dev,
+			 "Couldn't update frequency transition information.\n");
 
 	devfreq->previous_freq = new_freq;