USB: gadget: remove duplicated #include

Removed duplicated #include in
  drivers/usb/gadget/ci13xxx_udc.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/ci13xxx_udc.c

@@ -56,7 +56,6 @@
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
-#include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>