usb: gadget: pxa27x: Remove duplicate function prototype

Functions udc_enable() and udc_disable() have a duplicated prototype.
Remove it.
Acked-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NPetr Cvek <petr.cvek@tul.cz>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/udc/pxa27x_udc.c

@@ -1608,9 +1608,6 @@ static int pxa_udc_pullup(struct usb_gadget *_gadget, int is_active)
 	return 0;
 }
 
-static void udc_enable(struct pxa_udc *udc);
-static void udc_disable(struct pxa_udc *udc);
-
 /**
  * pxa_udc_vbus_session - Called by external transceiver to enable/disable udc
  * @_gadget: usb gadget