Updating license file according to internal template, removing what is not needed from the end

Author: silabs-akosj

LICENSE

@@ -1,8 +1,8 @@
 **Copyright 2025 Silicon Laboratories Inc. [www.silabs.com](https://www.silabs.com/)**
 
-Source code in this repo is covered by one of several different licenses.
-The default license is the Master Software License Agreement (MSLA) (https://www.silabs.com/about-us/legal/master-software-license-agreement), which applies unless otherwise noted.
+SPDX-License-Identifier: LicenseRef-MSLA
 
-During the unit test build process, some third-party code will be added to this
-repository and separated into another license. An example can be found in the
-build/_deps directory, where the Unity library uses the MIT license.
+The licensor of this software is Silicon Laboratories Inc.
+Your use of this software is governed by the terms of the Silicon Labs Master Software License Agreement (MSLA) available at
+[www.silabs.com/about-us/legal/master-software-license-agreement](www.silabs.com/about-us/legal/master-software-license-agreement).
+By installing, copying or otherwise using this software, you agree to the terms of the MSLA.