IVGCVSW-4449 Add QLstm ref implementation

* Adds ref implemenation for new HAL 1.3
  operator, QLstm.
* Adds Layer and CreateWorkload unit tests.
* Adds WorkloadData validate for QLstm.

Signed-off-by: James Conroy <james.conroy@arm.com>
Change-Id: I8a721f07ff06105e6495a1a0561b9503aa8146dc
diff --git a/src/backends/backendsCommon/test/layerTests/LstmTestImpl.hpp b/src/backends/backendsCommon/test/layerTests/LstmTestImpl.hpp
index dad1760..f1180ae 100644
--- a/src/backends/backendsCommon/test/layerTests/LstmTestImpl.hpp
+++ b/src/backends/backendsCommon/test/layerTests/LstmTestImpl.hpp
@@ -58,3 +58,11 @@
 LayerTestResult<uint8_t, 2> QuantizedLstmTest(
     armnn::IWorkloadFactory& workloadFactory,
     const armnn::IBackendInternal::IMemoryManagerSharedPtr& memoryManager);
+
+//
+// QLstm
+//
+
+LayerTestResult<int8_t, 2> QLstmTest(
+    armnn::IWorkloadFactory& workloadFactory,
+    const armnn::IBackendInternal::IMemoryManagerSharedPtr& memoryManager);