sparc: Use the core irq stats function

Let the core do the irq_desc resolution.

No functional change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: David S. Miller <davem@davemloft.net>
Link: http://lkml.kernel.org/r/20140223212737.635609567@linutronix.deSigned-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/sparc/kernel/time_64.c

@@ -733,7 +733,7 @@ void __irq_entry timer_interrupt(int irq, struct pt_regs *regs)
 	irq_enter();
 
 	local_cpu_data().irq0_irqs++;
-	kstat_incr_irqs_this_cpu(0, irq_to_desc(0));
+	kstat_incr_irq_this_cpu(0);
 
 	if (unlikely(!evt->event_handler)) {
 		printk(KERN_WARNING