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/include/armnn/Types.hpp b/include/armnn/Types.hpp
index 5ea214e..1ab5660 100644
--- a/include/armnn/Types.hpp
+++ b/include/armnn/Types.hpp
@@ -80,6 +80,15 @@
     NotEqual       = 5
 };
 
+enum class UnaryOperation
+{
+    Abs   = 0,
+    Exp   = 1,
+    Sqrt  = 2,
+    Rsqrt = 3,
+    Neg   = 4
+};
+
 enum class PoolingAlgorithm
 {
     Max     = 0,