PM / devfreq: correct misleading comment

_remove_devfreq() does not have @skip anymore after 3.16.
The comment for _remove_devfreq() has been updated correspondingly.
Signed-off-by: NMyungJoo Ham <myungjoo.ham@samsung.com>

drivers/devfreq/devfreq.c

@@ -392,7 +392,6 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type,
 /**
  * _remove_devfreq() - Remove devfreq from the list and release its resources.
  * @devfreq:	the devfreq struct
- * @skip:	skip calling device_unregister().
  */
 static void _remove_devfreq(struct devfreq *devfreq)
 {