bcma: make bcma_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the bcma_bus_type variable to be a constant structure as well,
placing it into read-only memory which can not be modified at runtime.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240204-bus_cleanup-bcma-v1-1-0d881c793190@marliere.net

drivers/bcma/main.c

@@ -68,7 +68,7 @@ static struct attribute *bcma_device_attrs[] = {
 };
 ATTRIBUTE_GROUPS(bcma_device);
 
-static struct bus_type bcma_bus_type = {
+static const struct bus_type bcma_bus_type = {
 	.name		= "bcma",
 	.match		= bcma_bus_match,
 	.probe		= bcma_device_probe,