IVGCVSW-3993 Add frontend and reference workload for ComparisonLayer

* Added frontend for ComparisonLayer
* Added RefComparisonWorkload
* Deprecated and removed Equal and Greater layers and workloads
* Updated tests to ensure backward compatibility

Signed-off-by: Aron Virginas-Tar <Aron.Virginas-Tar@arm.com>
Change-Id: Id50c880be1b567c531efff919c0c366d0a71cbe9
diff --git a/include/armnn/Types.hpp b/include/armnn/Types.hpp
index dbcb91a..16a148c 100644
--- a/include/armnn/Types.hpp
+++ b/include/armnn/Types.hpp
@@ -60,6 +60,16 @@
     Max = 1
 };
 
+enum class ComparisonOperation
+{
+    Equal          = 0,
+    Greater        = 1,
+    GreaterOrEqual = 2,
+    Less           = 3,
+    LessOrEqual    = 4,
+    NotEqual       = 5
+};
+
 enum class PoolingAlgorithm
 {
     Max     = 0,