Add support for firmware update

src/iface-update.h

@@ -0,0 +1,8 @@
+// SPDX-FileCopyrightText: 2024 Geoffrey D. Bennett <g@b4.vu>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "alsa.h"
+
+GtkWidget *create_iface_update_main(struct alsa_card *card);