usb: gadget: udc: net2280: Remove restart_dma inline function definition

restart_dma is not used before it is declaration. Therefore we can
remove this definition.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/udc/net2280.c

@@ -1043,8 +1043,6 @@ dma_done(struct net2280_ep *ep,	struct net2280_request *req, u32 dmacount,
 	done(ep, req, status);
 }
 
-static void restart_dma(struct net2280_ep *ep);
-
 static void scan_dma_completions(struct net2280_ep *ep)
 {
 	/* only look at descriptors that were "naturally" retired,