dm: core: Rename of_device_is_compatible()

The of_ prefix conflicts with the livetree version of this function.
Rename it to avoid problems when we add livetree support.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/usb/host/xhci-rockchip.c b/drivers/usb/host/xhci-rockchip.c
index 5e7130f..38e1c68 100644
--- a/drivers/usb/host/xhci-rockchip.c
+++ b/drivers/usb/host/xhci-rockchip.c
@@ -55,7 +55,7 @@
 	/* Get the base address for usbphy from the device node */
 	for (device_find_first_child(dev, &child); child;
 	     device_find_next_child(&child)) {
-		if (!of_device_is_compatible(child, "rockchip,rk3399-usb3-phy"))
+		if (!device_is_compatible(child, "rockchip,rk3399-usb3-phy"))
 			continue;
 		plat->phy_base = devfdt_get_addr(child);
 		break;