MLCE-530 Add front end support for UnidirectionalSequenceLstm on ArmNN

Signed-off-by: Narumol Prangnawarat <narumol.prangnawarat@arm.com>
Change-Id: I57bcbdec3eb0155f41af0fe7d6abf9bac2ec86eb
diff --git a/src/backends/backendsCommon/LayerSupportBase.cpp b/src/backends/backendsCommon/LayerSupportBase.cpp
index 8a24e11..138d453 100644
--- a/src/backends/backendsCommon/LayerSupportBase.cpp
+++ b/src/backends/backendsCommon/LayerSupportBase.cpp
@@ -678,4 +678,17 @@
     return DefaultLayerSupport(__func__, __FILE__, __LINE__, reasonIfUnsupported);
 }
 
+bool LayerSupportBase::IsUnidirectionalSequenceLstmSupported(const TensorInfo&, // input
+                                                             const TensorInfo&, // outputStateIn
+                                                             const TensorInfo&, // cellStateIn
+                                                             const TensorInfo&, // output
+                                                             const Optional<TensorInfo>&, // hiddenStateOut
+                                                             const Optional<TensorInfo>&, // cellStateOut
+                                                             const LstmDescriptor&, // descriptor
+                                                             const LstmInputParamsInfo&, // paramsInfo
+                                                             Optional<std::string&> reasonIfUnsupported) const
+{
+    return DefaultLayerSupport(__func__, __FILE__, __LINE__, reasonIfUnsupported);
+}
+
 } // namespace armnn