genirq: Remove real old transition functions

These transition helpers are stale for years now. Remove them.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/irq/autoprobe.c

@@ -46,12 +46,6 @@ unsigned long probe_irq_on(void)
 	for_each_irq_desc_reverse(i, desc) {
 		raw_spin_lock_irq(&desc->lock);
 		if (!desc->action && irq_settings_can_probe(desc)) {
-			/*
-			 * An old-style architecture might still have
-			 * the handle_bad_irq handler there:
-			 */
-			compat_irq_chip_set_default_handler(desc);
-
 			/*
 			 * Some chips need to know about probing in
 			 * progress: