usb: dwc2-otg: adjust fifo size via platform data

The total FIFO size of some SoCs may be different from the existen, this
patch supports fifo size setting from platform data.

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/include/usb/dwc2_udc.h b/include/usb/dwc2_udc.h
index 3ce43f8..7324d8a 100644
--- a/include/usb/dwc2_udc.h
+++ b/include/usb/dwc2_udc.h
@@ -20,6 +20,9 @@
 	unsigned int    usb_phy_ctrl;
 	unsigned int    usb_flags;
 	unsigned int	usb_gusbcfg;
+	unsigned int	rx_fifo_sz;
+	unsigned int	np_tx_fifo_sz;
+	unsigned int	tx_fifo_sz;
 };
 
 int dwc2_udc_probe(struct dwc2_plat_otg_data *pdata);