MLCE-328 Serializer/Deserializer does not support Signed64

 * Added support for Signed64 to flatbuffer's schema & updated source tree
 * Added support for Signed64 to TFLite Delegate
 * Added support for Signed64 to Serializer
 * Added support for Signed64 to Deserializer
 * Added unit test for ArgMinMax to Deserializer
 * Deprecated m_Output_Type from the ArgMinMaxDescriptor: the output type
   is solely determined by the DataType of the output Tensor
 * Fixed issue where RefArgMinMaxWorkload could output data using
   the wrong DataType
 * Added Signed64 to RefLayerSupport::IsArgMinMaxSupported as a supported
   type

Signed-off-by: Mike Kelly <mike.kelly@arm.com>
Signed-off-by: Matthew Sloyan <matthew.sloyan@arm.com>
Change-Id: Ib622c052a1f8aa3e658262f8bde5a6881a8cbe10
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 049a4f1..8ccb270 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -922,6 +922,7 @@
             src/armnnDeserializer/test/DeserializeAbs.cpp
             src/armnnDeserializer/test/DeserializeActivation.cpp
             src/armnnDeserializer/test/DeserializeAdd.cpp
+            src/armnnDeserializer/test/DeserializeArgMinMax.cpp
             src/armnnDeserializer/test/DeserializeBatchToSpaceNd.cpp
             src/armnnDeserializer/test/DeserializeBatchNormalization.cpp
             src/armnnDeserializer/test/DeserializeComparison.cpp