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: NJisheng Zhang <jszhang@marvell.com>
Link: https://lkml.kernel.org/r/1413982750-832-1-git-send-email-jszhang@marvell.comSigned-off-by: NJason Cooper <jason@lakedaemon.net>

drivers/irqchip/Kconfig

@@ -56,6 +56,7 @@ config BRCMSTB_L2_IRQ
 
 config DW_APB_ICTL
 	bool
+	select GENERIC_IRQ_CHIP
 	select IRQ_DOMAIN
 
 config IMGPDC_IRQ