MLECO-3583: Update copyright notice according to new guidelines

Change-Id: I0f057b33993e5196a60e52f4fb0c60e09693dcfe
diff --git a/tests/use_case/ad/AdTests.cc b/tests/use_case/ad/AdTests.cc
index 09f82da..8ca3ee2 100644
--- a/tests/use_case/ad/AdTests.cc
+++ b/tests/use_case/ad/AdTests.cc
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Arm Limited. All rights reserved.
+ * SPDX-FileCopyrightText: Copyright 2021 Arm Limited and/or its affiliates <open-source-office@arm.com>
  * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");