IVGCVSW-3399 Add QSymm16 IsLayerSupportedTest to reference backend

 * Refactor and add QSymm16 to IsDepthwiseConvolutionSupported
 * Refactor and add QSymm16 to IsEqualSupported
 * Refactor and add QSymm16 to IsGreaterSupported
 * Refactor and add QSymm16 to IsSplitterSupported
 * Refactor and add QSymm16 to IsStridedSliceSupported
 * Refactor and add QSymm16 to IsMemCopySupported
 * Refactor IsFakeQuantizationSupported

Signed-off-by: Narumol Prangnawarat <narumol.prangnawarat@arm.com>
Change-Id: I4f115a5535748fc22df8bc90b24b537fd5dd95b8
diff --git a/src/backends/backendsCommon/WorkloadFactory.cpp b/src/backends/backendsCommon/WorkloadFactory.cpp
index 1aca6bf..3502c38 100644
--- a/src/backends/backendsCommon/WorkloadFactory.cpp
+++ b/src/backends/backendsCommon/WorkloadFactory.cpp
@@ -297,6 +297,7 @@
                         break;
                     }
                     case DataType::QuantisedAsymm8:
+                    case DataType::QuantisedSymm16:
                     {
                         biasInfoPtr = &dummyQA8Bias;
                         break;