arm: omap: irq: remove unnecessary header

There's no need for that header to be included.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/irq.c

@@ -24,7 +24,6 @@
 #include <linux/of_irq.h>
 
 #include "soc.h"
-#include "iomap.h"
 #include "common.h"
 #include "../../drivers/irqchip/irqchip.h"