IVGCVSW-3342 Add CL backend support for Quantized_LSTM (16bit cell state)

!android-nn-driver:1685

Signed-off-by: Ferran Balaguer <ferran.balaguer@arm.com>
Signed-off-by: Matthew Bentham <matthew.bentham@arm.com>
Change-Id: I17278562f72d4b77e22c3af25bf7199b9150a765
diff --git a/src/backends/cl/ClLayerSupport.hpp b/src/backends/cl/ClLayerSupport.hpp
index 4879e8b..a367085 100644
--- a/src/backends/cl/ClLayerSupport.hpp
+++ b/src/backends/cl/ClLayerSupport.hpp
@@ -175,6 +175,14 @@
                           const TensorInfo& output,
                           Optional<std::string&> reasonIfUnsupported = EmptyOptional()) const override;
 
+    bool IsQuantizedLstmSupported(const TensorInfo& input,
+                                  const TensorInfo& previousCellStateIn,
+                                  const TensorInfo& previousOutputIn,
+                                  const TensorInfo& cellStateOut,
+                                  const TensorInfo& output,
+                                  const QuantizedLstmInputParamsInfo& paramsInfo,
+                                  Optional<std::string&> reasonIfUnsupported = EmptyOptional()) const override;
+
     bool IsQuantizeSupported(const TensorInfo& input,
                              const TensorInfo& output,
                              Optional<std::string&> reasonIfUnsupported = EmptyOptional()) const override;