IVGCVSW-3013 Add unit tests for QSymm16 LSTM

* Add unit tests for QSymm16 LSTM
* Update supportedTypes in WorkloadData & RefLayerSupport with
  DataType::QuantisedSymm16

Change-Id: I1a2627b11b707d68d7d7002f63b985f9571ee177
Signed-off-by: Conor Kennedy <conor.kennedy@arm.com>
diff --git a/src/backends/reference/test/RefLayerTests.cpp b/src/backends/reference/test/RefLayerTests.cpp
index 04b215a..b260002 100644
--- a/src/backends/reference/test/RefLayerTests.cpp
+++ b/src/backends/reference/test/RefLayerTests.cpp
@@ -458,6 +458,15 @@
 ARMNN_AUTO_TEST_CASE(LstmLayerFloat32NoCifgWithPeepholeWithProjection,
                      LstmLayerFloat32NoCifgWithPeepholeWithProjectionTest)
 
+ARMNN_AUTO_TEST_CASE(LstmLayerInt16NoCifgNoPeepholeNoProjection,
+                     LstmLayerInt16NoCifgNoPeepholeNoProjectionTest)
+ARMNN_AUTO_TEST_CASE(LstmLayerInt16WithCifgWithPeepholeNoProjection,
+                     LstmLayerInt16WithCifgWithPeepholeNoProjectionTest)
+ARMNN_AUTO_TEST_CASE(LstmLayerInt16NoCifgWithPeepholeWithProjection,
+                     LstmLayerInt16NoCifgWithPeepholeWithProjectionTest)
+ARMNN_AUTO_TEST_CASE(LstmLayerInt16NoCifgNoPeepholeNoProjectionInt16Constant,
+                     LstmLayerInt16NoCifgNoPeepholeNoProjectionInt16ConstantTest)
+
 // Convert from Float16 to Float32
 ARMNN_AUTO_TEST_CASE(SimpleConvertFp16ToFp32, SimpleConvertFp16ToFp32Test)
 // Convert from Float32 to Float16