IVGCVSW-3740 Add Reference Workload support for ABS

 * Implemented RefAbsWorkload and unit tests

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: Ibfcdb2b37fd8d240c181f96856e2c997a4b88914
diff --git a/src/backends/reference/workloads/RefWorkloads.hpp b/src/backends/reference/workloads/RefWorkloads.hpp
index e86dccd..1ec349e 100644
--- a/src/backends/reference/workloads/RefWorkloads.hpp
+++ b/src/backends/reference/workloads/RefWorkloads.hpp
@@ -5,6 +5,7 @@
 
 #pragma once
 
+#include "Abs.hpp"
 #include "Activation.hpp"
 #include "BatchNormImpl.hpp"
 #include "ConvImpl.hpp"
@@ -13,6 +14,7 @@
 #include "FullyConnected.hpp"
 #include "Gather.hpp"
 #include "Pooling2d.hpp"
+#include "RefAbsWorkload.hpp"
 #include "RefActivationWorkload.hpp"
 #include "RefBatchNormalizationWorkload.hpp"
 #include "RefBatchToSpaceNdWorkload.hpp"