cmd: rockusb: Use plain udevice for UDC controller interaction

Convert to plain udevice interaction with UDC controller
device, avoid the use of UDC uclass dev_array .

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
diff --git a/cmd/rockusb.c b/cmd/rockusb.c
index f181ec6..0708856 100644
--- a/cmd/rockusb.c
+++ b/cmd/rockusb.c
@@ -15,6 +15,7 @@
 {
 	int controller_index, dev_index;
 	char *usb_controller;
+	struct udevice *udc;
 	char *devtype;
 	char *devnum;
 	int ret;
@@ -34,7 +35,7 @@
 	dev_index = simple_strtoul(devnum, NULL, 0);
 	rockusb_dev_init(devtype, dev_index);
 
-	ret = usb_gadget_initialize(controller_index);
+	ret = udc_device_get_by_index(controller_index, &udc);
 	if (ret) {
 		printf("USB init failed: %d\n", ret);
 		return CMD_RET_FAILURE;
@@ -56,14 +57,14 @@
 			break;
 		if (ctrlc())
 			break;
-		usb_gadget_handle_interrupts(controller_index);
+		dm_usb_gadget_handle_interrupts(udc);
 	}
 	ret = CMD_RET_SUCCESS;
 
 exit:
 	g_dnl_unregister();
 	g_dnl_clear_detach();
-	usb_gadget_release(controller_index);
+	udc_device_put(udc);
 
 	return ret;
 }