IVGCVSW-4386 Add ArmNN reference support for QAsymmS8

 * Added Quantization Scheme for QAsymmS8
 * Added Unit Tests for QAsymmS8
 * Renamed QAsymm8 calls to QAsymmU8

Signed-off-by: Ryan OShea <Ryan.OShea2@arm.com>
Change-Id: I897b4e018ba1d808cc3f8c113f2be2dbad49c8db
diff --git a/src/backends/backendsCommon/test/layerTests/DequantizeTestImpl.hpp b/src/backends/backendsCommon/test/layerTests/DequantizeTestImpl.hpp
index c70f03e..1e079a7 100644
--- a/src/backends/backendsCommon/test/layerTests/DequantizeTestImpl.hpp
+++ b/src/backends/backendsCommon/test/layerTests/DequantizeTestImpl.hpp
@@ -20,6 +20,14 @@
     armnn::IWorkloadFactory& workloadFactory,
     const armnn::IBackendInternal::IMemoryManagerSharedPtr& memoryManager);
 
+LayerTestResult<float, 4> DequantizeSimpleAsymmInt8Test(
+    armnn::IWorkloadFactory& workloadFactory,
+    const armnn::IBackendInternal::IMemoryManagerSharedPtr& memoryManager);
+
+LayerTestResult<float, 4> DequantizeOffsetAsymmInt8Test(
+    armnn::IWorkloadFactory& workloadFactory,
+    const armnn::IBackendInternal::IMemoryManagerSharedPtr& memoryManager);
+
 LayerTestResult<float, 4> DequantizeSimpleInt8Test(
         armnn::IWorkloadFactory& workloadFactory,
         const armnn::IBackendInternal::IMemoryManagerSharedPtr& memoryManager);