staging: greybus: arche-platform: Format block comments.

Fix checkpatch warning:

WARNING: Block comments use a trailing */ on a separate line
Signed-off-by: Elise Lennion <elise.lennion@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/arche-platform.c

@@ -455,7 +455,8 @@ static ssize_t state_store(struct device *dev,
 			goto exit;
 
 		/* First we want to make sure we power off everything
-		 * and then activate back again */
+		 * and then activate back again
+		 */
 		device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
 		arche_platform_poweroff_seq(arche_pdata);