usb: Migrate to support live DT for some driver

Use ofnode_ instead of fdt_ APIs so that the drivers can support live DT.
This patch updates usb_get_dr_mode() and usb_get_maximum_speed() to use
ofnode as parameter instead of fdt offset. And all the drivers who use
these APIs update to use live dt APIs at the same time.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/usb/dwc3/dwc3-meson-g12a.c b/drivers/usb/dwc3/dwc3-meson-g12a.c
index 832bcd7..d4453f8 100644
--- a/drivers/usb/dwc3/dwc3-meson-g12a.c
+++ b/drivers/usb/dwc3/dwc3-meson-g12a.c
@@ -393,7 +393,7 @@
 	}
 #endif
 
-	priv->otg_mode = usb_get_dr_mode(dev_of_offset(dev));
+	priv->otg_mode = usb_get_dr_mode(dev->node);
 
 	ret = dwc3_meson_g12a_usb_init(priv);
 	if (ret)