ide: add "optical" to sysfs "media" attribute

Add "optical" to sysfs "media" attribute as already in /proc
Signed-off-by: Danny Kukawka <dkukawka@suse.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide.c

@@ -1962,6 +1962,8 @@ static char *media_string(ide_drive_t *drive)
 		return "tape";
 	case ide_floppy:
 		return "floppy";
+	case ide_optical:
+		return "optical";
 	default:
 		return "UNKNOWN";
 	}