IVGCVSW-6620 Update the async api to use ExecutionData

* ExecutionData holds a void* which can be assigned to data required
  for execution in a backend. WorkingMemDescriptors are used in the Ref
  backend which hold TensorHandles for inputs and outputs.
* Updated ExecuteAsync functions to take ExecutionData.
* Added CreateExecutionData and UpdateExectutionData to IBackendInternal.
* Streamlined experimental IWorkingMemHandle API by removing map related
  function and unused m_workingMemDescriptorMap from WorkingMemHandle.

Signed-off-by: Matthew Sloyan <matthew.sloyan@arm.com>
Change-Id: I54b0aab12872011743a141eb42dae200227769af
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f115f46..7506452 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -340,6 +340,7 @@
     src/armnn/DeviceSpec.hpp
     src/armnn/DllExport.hpp
     src/armnn/Exceptions.cpp
+    src/armnn/ExecutionData.hpp
     src/armnn/ExecutionFrame.cpp
     src/armnn/ExecutionFrame.hpp
     src/armnn/Graph.cpp