irqchip: dw-apb-ictl: Select GENERIC_IRQ_CHIP

The dw-apb-ictl driver uses the generic-chip functions.
Thus it needs to select GENERIC_IRQ_CHIP in Kconfig.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Link: https://lkml.kernel.org/r/1413982750-832-1-git-send-email-jszhang@marvell.com


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