driver core: class: make class_register() take a const *

Now that the class code is cleaned up to not modify the class pointer
registered with it, change class_register() to take a const * to allow
the structure to be placed into read-only memory.

Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/2023040248-customary-release-4aec@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/device/class.h

@@ -76,7 +76,7 @@ struct class_dev_iter {
 	const struct device_type	*type;
 };
 
-int __must_check class_register(struct class *class);
+int __must_check class_register(const struct class *class);
 void class_unregister(const struct class *class);
 bool class_is_registered(const struct class *class);