usb: rockchip-phy: implement USB2.0 phy control

So far, Rockchip SoCs have two kinds of USB2.0 phy, such as Synopsys and
Innosilicon. This patch applys dwc2 usb driver framework to implement
phy_init() and phy_off() methods for Synopsys phy on Rockchip platform.

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 302e9a3..3ce43f8 100644
--- a/include/usb/dwc2_udc.h
+++ b/include/usb/dwc2_udc.h
@@ -12,6 +12,8 @@
 #define PHY0_SLEEP              (1 << 5)
 
 struct dwc2_plat_otg_data {
+	void		*priv;
+	int		phy_of_node;
 	int		(*phy_control)(int on);
 	unsigned int	regs_phy;
 	unsigned int	regs_otg;