PM / devfreq: correct comment typo.

The function name in the comment was incorrect.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/devfreq/devfreq.c

@@ -850,7 +850,7 @@ err_out:
 EXPORT_SYMBOL(devfreq_add_governor);
 
 /**
- * devfreq_remove_device() - Remove devfreq feature from a device.
+ * devfreq_remove_governor() - Remove devfreq feature from a device.
  * @governor:	the devfreq governor to be removed
  */
 int devfreq_remove_governor(struct devfreq_governor *governor)