ARM: OMAP: remove duplicated #include's

Removed duplicated #include's in arch/arm/mach-omap1/board-voiceblue.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap1/board-voiceblue.c

@@ -22,7 +22,6 @@
 #include <linux/reboot.h>
 #include <linux/serial_8250.h>
 #include <linux/serial_reg.h>
-#include <linux/irq.h>
 
 #include <mach/hardware.h>
 #include <asm/mach-types.h>