irqchip: mmp: support irqchip

Support IRQCHIP & CONFIG_MULTI_IRQ_HANDLER in irq-mmp driver.

Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Reviewed-by: Daniel Drake <dsd@laptop.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ba412e0..76793a6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -557,6 +557,7 @@
 	select GENERIC_CLOCKEVENTS
 	select GPIO_PXA
 	select IRQ_DOMAIN
+	select MULTI_IRQ_HANDLER
 	select NEED_MACH_GPIO_H
 	select PINCTRL
 	select PLAT_PXA