nvidia-oot: Add aon kmd module

- This patch includes AON-KMD module as part of OOT kernel.

Bug 3583580

Change-Id: I531731136189d76ebb4d3f2880e8f46913f390f4
Signed-off-by: Akhilesh Khumbum <akhumbum@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2870990
Reviewed-by: Robert Collins <rcollins@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

include/linux/tegra-aon.h

@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2015-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ */
+
+#ifndef _LINUX_TEGRA_AON_H
+#define _LINUX_TEGRA_AON_H
+
+struct tegra_aon_mbox_msg {
+	int length;
+	void *data;
+};
+
+#endif