mcb: move to_mcb_device() to use container_of_const()

The driver core is changing to pass some pointers as const, so move
to_mcb_device() to use container_of_const() to handle this change.

to_mcb_device() now properly keeps the const-ness of the pointer passed
into it, while as before it could be lost.

Cc: Johannes Thumshirn <morbidrsa@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230111113018.459199-14-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/mcb.h

@@ -76,10 +76,7 @@ struct mcb_device {
 	struct device *dma_dev;
 };
 
-static inline struct mcb_device *to_mcb_device(struct device *dev)
-{
-	return container_of(dev, struct mcb_device, dev);
-}
+#define to_mcb_device(__dev)	container_of_const(__dev, struct mcb_device, dev)
 
 /**
  * struct mcb_driver - MEN Chameleon Bus device driver