IVGCVSW-6635 Move MemCopyTestImpl from acl to armnnTestUtils.

* Move MemCopyTestImpl.hpp from src/backends/aclCommon/test/ to
  include/armnnTestutils.
* Refactor MemCopyTests in aclCommon, cl and Neon.
* Introduce RefMemCopyTests to exercise this utility in x86 builds.

Signed-off-by: Colm Donelan <colm.donelan@arm.com>
Change-Id: I8824f013d3656658ed0a2904bb79384e3af68641
diff --git a/src/backends/cl/test/OpenClTimerTest.cpp b/src/backends/cl/test/OpenClTimerTest.cpp
index 3d27390..24a0afa 100644
--- a/src/backends/cl/test/OpenClTimerTest.cpp
+++ b/src/backends/cl/test/OpenClTimerTest.cpp
@@ -7,7 +7,7 @@
 
 #include "ClWorkloadFactoryHelper.hpp"
 
-#include <TensorHelpers.hpp>
+#include <armnnTestUtils/TensorHelpers.hpp>
 
 #include <armnn/backends/TensorHandle.hpp>
 #include <armnn/backends/WorkloadFactory.hpp>