IVGCVSW-3975 Add reference workload for LOG_SOFTMAX

Signed-off-by: Aron Virginas-Tar <Aron.Virginas-Tar@arm.com>
Change-Id: I10bb7133e0e2d6d7199abdf39562b1226bbbd3e7
diff --git a/src/backends/reference/RefLayerSupport.hpp b/src/backends/reference/RefLayerSupport.hpp
index 36080f7..5c71e8d 100644
--- a/src/backends/reference/RefLayerSupport.hpp
+++ b/src/backends/reference/RefLayerSupport.hpp
@@ -149,6 +149,11 @@
                                     const L2NormalizationDescriptor& descriptor,
                                     Optional<std::string&> reasonIfUnsupported = EmptyOptional()) const override;
 
+    bool IsLogSoftmaxSupported(const TensorInfo& input,
+                               const TensorInfo& output,
+                               const LogSoftmaxDescriptor& descriptor,
+                               Optional<std::string&> reasonIfUnsupported) const override;
+
     bool IsLstmSupported(const TensorInfo& input,
                          const TensorInfo& outputStateIn,
                          const TensorInfo& cellStateIn,