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/backendsCommon/WorkloadData.cpp b/src/backends/backendsCommon/WorkloadData.cpp
index d8c10bd..b7317af 100644
--- a/src/backends/backendsCommon/WorkloadData.cpp
+++ b/src/backends/backendsCommon/WorkloadData.cpp
@@ -1720,7 +1720,8 @@
     {
         DataType::Float16,
         DataType::Float32,
-        DataType::QuantisedAsymm8
+        DataType::QuantisedAsymm8,
+        DataType::QuantisedSymm16
     };
 
     ValidateDataTypes(workloadInfo.m_InputTensorInfos[0],