Fix remain copyright header issues for .in files (#4177)

Signed-off-by: Steve Pham <spham@amazon.com>

Code/Tools/Android/ProjectBuilder/root.build.gradle.in

@@ -1,12 +1,9 @@
 //
-// All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
-// its licensors.
+// Copyright (c) Contributors to the Open 3D Engine Project.
+// For complete copyright and license terms please see the LICENSE at the root of this distribution.
+//
+// SPDX-License-Identifier: Apache-2.0 OR MIT
 //
-// For complete copyright and license terms please see the LICENSE at the root of this
-// distribution (the "License"). All use of this software is governed by the License,
-// or, if provided, by the license below or the license accompanying this file. Do not
-// remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 
 buildscript {
     repositories {