ARM: mxc: convert tzic to use generic irq chip

The patch converts mxc tzic interrupt controller to use generic irq
chip.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9adc278..3002266 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -376,6 +376,7 @@
 	select ARCH_REQUIRE_GPIOLIB
 	select CLKDEV_LOOKUP
 	select CLKSRC_MMIO
+	select GENERIC_IRQ_CHIP
 	select HAVE_SCHED_CLOCK
 	help
 	  Support for Freescale MXC/iMX-based family of processors