IVGCVSW-4611 PRELU float16 VTS test skipped in CpuRef

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
Change-Id: Id908e0bcbefd3284da51cdbe8ec0c2181b9b553e
diff --git a/src/backends/reference/RefLayerSupport.cpp b/src/backends/reference/RefLayerSupport.cpp
index 034cd12..3bcb7e0 100644
--- a/src/backends/reference/RefLayerSupport.cpp
+++ b/src/backends/reference/RefLayerSupport.cpp
@@ -366,9 +366,10 @@
 bool RefLayerSupport::IsConstantSupported(const TensorInfo& output,
                                           Optional<std::string&> reasonIfUnsupported) const
 {
-    std::array<DataType,7> supportedTypes =
+    std::array<DataType,8> supportedTypes =
     {
         DataType::BFloat16,
+        DataType::Float16,
         DataType::Float32,
         DataType::QAsymmS8,
         DataType::QAsymmU8,