irqchip: atmel-aic: Convert to handle_domain_irq

Use the new handle_domain_irq method to handle interrupts.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Link: https://lkml.kernel.org/r/1409047421-27649-20-git-send-email-marc.zyngier@arm.com


Signed-off-by: Jason Cooper <jason@lakedaemon.net>