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>