USB: mark all struct bus_type as const

Now that the driver core can properly handle constant struct bus_type,
move all of the USB subsystem struct bus_type structures as const,
placing them into read-only memory which can not be modified at runtime.

Cc: Johan Hovold <johan@kernel.org>
Cc: Evan Green <evgreen@chromium.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-usb@vger.kernel.org
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20230313182918.1312597-36-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/common/ulpi.c

@@ -90,7 +90,7 @@ static void ulpi_remove(struct device *dev)
 		drv->remove(to_ulpi_dev(dev));
 }
 
-static struct bus_type ulpi_bus = {
+static const struct bus_type ulpi_bus = {
 	.name = "ulpi",
 	.match = ulpi_match,
 	.uevent = ulpi_uevent,