Update the AzFramework and AzCore cmake files to point at the new location of the PlatformDefaults.h and PlatformDefaults.cpp file

Added an inline namespace for the PlatformDefaults code to ease with aliasing it into the AzFramework namespace

Code/Framework/AzFramework/AzFramework/Platform/PlatformDefaults.h

@@ -0,0 +1,23 @@
+/*
+* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+* its licensors.
+*
+* 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.
+*
+*/
+
+#pragma once
+
+#include <AzCore/PlatformId/PlatformDefaults.h>
+
+// As the Platform defaults is needed within AzCore,
+// those structures have been moved to AzCore and brought into
+// The AzFramework namespace for backwards compatibility
+namespace AzFramework
+{
+    using namespace AZ::PlatformDefaults;
+}

Code/Framework/AzFramework/AzFramework/azframework_files.cmake

@@ -317,7 +317,6 @@ set(FILES
     Terrain/TerrainDataRequestBus.h
     Terrain/TerrainDataRequestBus.cpp
     Platform/PlatformDefaults.h
-    Platform/PlatformDefaults.cpp
     Windowing/WindowBus.h
     Windowing/NativeWindow.cpp
     Windowing/NativeWindow.h