doc: board: ti: Add SPDX License to svg images

Add Licensing to svg images to clarify the terms.

Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/doc/board/ti/img/boot_flow_02.svg b/doc/board/ti/img/boot_flow_02.svg
index 4e282d8..9357021 100644
--- a/doc/board/ti/img/boot_flow_02.svg
+++ b/doc/board/ti/img/boot_flow_02.svg
@@ -1,4 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!--SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause-->
+
+<!--Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/-->
+
 <svg
    version="1.1"
    width="751px"