[ARM] S3C24XX: remove duplicated #include

Remove duplicated #include in arch/arm/mach-s3c2410/usb-simtec.c.
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c2410/usb-simtec.c

@@ -22,7 +22,6 @@
 #include <linux/timer.h>
 #include <linux/init.h>
 #include <linux/device.h>
-#include <linux/gpio.h>
 #include <linux/io.h>
 
 #include <asm/mach/arch.h>