dm: usb: sandbox: Reset emulation devices in usb stop()

These devices must have their addresses removed ready for the next USB
bus enumeration. Add this logic to usb_stop().

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>

drivers/usb/host/usb-uclass.c

@@ -93,6 +93,17 @@ int usb_stop(void)
 			err = ret;
 	}
 
+#ifdef CONFIG_SANDBOX
+	struct udevice *dev;
+
+	/* Reset all enulation devices */
+	ret = uclass_get(UCLASS_USB_EMUL, &uc);
+	if (ret)
+		return ret;
+
+	uclass_foreach_dev(dev, uc)
+		usb_emul_reset(dev);
+#endif
 	usb_stor_reset();
 	usb_hub_reset();
 	usb_started = 0;