usb: renesas_usbhs: move pdev_to_priv to global

usbhs_pdev_to_priv function will be used in other files.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/renesas_usbhs/common.h b/drivers/usb/renesas_usbhs/common.h
index f1a2b62..f3b907d 100644
--- a/drivers/usb/renesas_usbhs/common.h
+++ b/drivers/usb/renesas_usbhs/common.h
@@ -217,6 +217,7 @@
 /*
  * data
  */
+struct usbhs_priv *usbhs_pdev_to_priv(struct platform_device *pdev);
 #define usbhs_get_dparam(priv, param)	(priv->dparam->param)
 #define usbhs_priv_to_pdev(priv)	(priv->pdev)
 #define usbhs_priv_to_dev(priv)		(&priv->pdev->dev)