genirq: Fix affinity notifier fallout

The new code of commit cd7eab44(genirq: Add IRQ affinity notifiers)
references irq_desc.affinity which fails to compile with
CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED=y.

Use irq_desc.irq_data.affinity instead.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ben Hutchings <bhutchings@solarflare.com>

kernel/irq/manage.c

@@ -179,7 +179,7 @@ static void irq_affinity_notify(struct work_struct *work)
 		cpumask_copy(cpumask, desc->pending_mask);
 	else
 #endif
-		cpumask_copy(cpumask, desc->affinity);
+		cpumask_copy(cpumask, desc->irq_data.affinity);
 	raw_spin_unlock_irqrestore(&desc->lock, flags);
 
 	notify->notify(notify, cpumask);