IVGCVSW-4259 Add frontend and reference workload for UnaryOperationLayer

* Added new layer named ElementwiseUnary
* Deprecated existing Abs/Rsqrt layer functions
* Updated existing Abs/Rsqrt test infrastructure to use new layer
* Added boilerplate for new Exp,Neg,Sqrt elemwise op layers
* AbsQuantize test removed pending future commit
* Serialization support added

!android-nn-driver:2550

Change-Id: Ic595c645925e17b45db568187fd05646daf2e87f
Signed-off-by: josh minor <josh.minor@arm.com>
diff --git a/src/backends/reference/workloads/Exp.hpp b/src/backends/reference/workloads/Exp.hpp
new file mode 100644
index 0000000..1a04672
--- /dev/null
+++ b/src/backends/reference/workloads/Exp.hpp
@@ -0,0 +1,22 @@
+//
+// Copyright © 2019 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include <iostream>
+
+namespace armnn
+{
+    template<typename T>
+struct exp : public std::unary_function<T, T>
+    {
+        T
+        operator () (const T&  inputData) const
+        {
+            return std::exp(inputData);
+        }
+    };
+
+} //namespace armnn