macintosh/mediabay: add a const qualifier

This prepares *of_device_id.data becoming const. Without this change
the following warning would occur:

	drivers/macintosh/mediabay.c: In function 'media_bay_attach':
	drivers/macintosh/mediabay.c:589:11: warning: assignment discards 'const' qualifier from pointer target type [enabled by default]
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/macintosh/mediabay.c

@@ -63,7 +63,7 @@ struct media_bay_info {
 	int				value_count;
 	int				timer;
 	struct macio_dev		*mdev;
-	struct mb_ops*			ops;
+	const struct mb_ops*		ops;
 	int				index;
 	int				cached_gpio;
 	int				sleeping;