irqchip/mxs: Add missing set_handle_irq()

The rework of the driver missed to move the call to set_handle_irq() into
asm9260_of_init(). As a consequence no interrupt entry point is installed and
no interrupts are delivered

Solution is:
Install the interrupt entry handler.

Fixes: 7e4ac676 ("irqchip/mxs: Add Alphascale ASM9260 support")
Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Link: https://lkml.kernel.org/r/1454061473-24957-1-git-send-email-linux@rempel-privat.deSigned-off-by: Jason Cooper <jason@lakedaemon.net>

drivers/irqchip/irq-mxs.c

@@ -241,6 +241,7 @@ static int __init asm9260_of_init(struct device_node *np,
 		writel(0, icoll_priv.intr + i);
 
 	icoll_add_domain(np, ASM9260_NUM_IRQS);
+	set_handle_irq(icoll_handle_irq);
 
 	return 0;
 }