usb: dwc2: make casts of ep->dma_buf consistent

In most places in the code we cast this to an unsigned long, but in one
place we cast to an unsigned int.  For consistency and to fix a warning
on 64bit targets, always cast this to unsigned long.  For the long term
we should however change the declaration of dma_buf.

Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Lukasz Majewski <lukma@denx.de>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>

drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c

@@ -114,7 +114,7 @@ static int setdma_rx(struct dwc2_ep *ep, struct dwc2_request *req)
 				(unsigned long) ep->dma_buf +
 				ROUND(ep->len, CONFIG_SYS_CACHELINE_SIZE));
 
-	writel((unsigned int) ep->dma_buf, &reg->out_endp[ep_num].doepdma);
+	writel((unsigned long) ep->dma_buf, &reg->out_endp[ep_num].doepdma);
 	writel(DOEPT_SIZ_PKT_CNT(pktcnt) | DOEPT_SIZ_XFER_SIZE(length),
 	       &reg->out_endp[ep_num].doeptsiz);
 	writel(DEPCTL_EPENA|DEPCTL_CNAK|ctrl, &reg->out_endp[ep_num].doepctl);