IVGCVSW-4604 ARGMINMAX float16 VTS test skipped in CpuRef

Change-Id: I75cca9804a67f629cddc83671397a84640e9bf0e
Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
diff --git a/src/backends/reference/RefLayerSupport.cpp b/src/backends/reference/RefLayerSupport.cpp
index 3bcb7e0..8ca18b5 100644
--- a/src/backends/reference/RefLayerSupport.cpp
+++ b/src/backends/reference/RefLayerSupport.cpp
@@ -181,9 +181,10 @@
 {
     IgnoreUnused(descriptor);
 
-    std::array<DataType, 6> supportedTypes =
+    std::array<DataType, 7> supportedTypes =
     {
         DataType::BFloat16,
+        DataType::Float16,
         DataType::Float32,
         DataType::QAsymmS8,
         DataType::QAsymmU8,