IVGCVSW-3268 Add Reference workload support for the new Prelu Activation layer

 * Added reference workload for the PReLU Activation layer
 * Added factory methods
 * Added validation support
 * Added Int16 support
 * Added unit tests

Change-Id: Ic950d908c5e0a335dccd2960a3ffab0f8b599876
Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
diff --git a/src/backends/reference/workloads/RefWorkloads.hpp b/src/backends/reference/workloads/RefWorkloads.hpp
index b141291..41b16fa 100644
--- a/src/backends/reference/workloads/RefWorkloads.hpp
+++ b/src/backends/reference/workloads/RefWorkloads.hpp
@@ -51,3 +51,4 @@
 #include "RefDequantizeWorkload.hpp"
 #include "RefQuantizeWorkload.hpp"
 #include "RefReshapeWorkload.hpp"
+#include "RefPreluWorkload.hpp"