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.de


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