cmd: fastboot: Use plain udevice for UDC controller interaction

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

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com> # on khadas vim3
Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/cmd/fastboot.c b/cmd/fastboot.c
index 3d5ff95..17fb0a0 100644
--- a/cmd/fastboot.c
+++ b/cmd/fastboot.c
@@ -61,6 +61,7 @@
 {
 	int controller_index;
 	char *usb_controller;
+	struct udevice *udc;
 	char *endp;
 	int ret;
 
@@ -79,7 +80,7 @@
 		return CMD_RET_FAILURE;
 	}
 
-	ret = usb_gadget_initialize(controller_index);
+	ret = udc_device_get_by_index(controller_index, &udc);
 	if (ret) {
 		pr_err("USB init failed: %d\n", ret);
 		return CMD_RET_FAILURE;
@@ -103,13 +104,13 @@
 		if (ctrlc())
 			break;
 		schedule();
-		usb_gadget_handle_interrupts(controller_index);
+		dm_usb_gadget_handle_interrupts(udc);
 	}
 
 	ret = CMD_RET_SUCCESS;
 
 exit:
-	usb_gadget_release(controller_index);
+	udc_device_put(udc);
 	g_dnl_unregister();
 	g_dnl_clear_detach();