ARM: imx: irq-common: Include header to avoid sparse warning

Fix the following sparse warning:

arch/arm/mach-imx/irq-common.c:24:5: warning: symbol 'mxc_set_irq_fiq' was not declared. Should it be static?
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/irq-common.c

@@ -18,6 +18,7 @@
 
 #include <linux/module.h>
 #include <linux/irq.h>
+#include <linux/platform_data/asoc-imx-ssi.h>
 
 #include "irq-common.h"