ARM: clps711x: Add CLPS711X irqchip driver

This adds the irqchip driver for Cirrus Logic CLPS711X series SoCs.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --cc arch/arm/Kconfig
Simple merge

diff --cc arch/arm/mach-clps711x/common.h
Simple merge

diff --cc drivers/irqchip/Kconfig
Simple merge

diff --cc drivers/irqchip/Makefile
Simple merge

diff --cc drivers/irqchip/irq-clps711x.c
Simple merge