IVGCVSW-2874 Add DequantizeLayer and no-op factory method

*Add Dequantize layer to the frontend
*Add Serializer and Deserializer for Dequantize

Change-Id: Ide2647b9e0348d599deb97e61ca4bf66e2f17fc0
Signed-off-by: Nattapat Chaimanowong <nattapat.chaimanowong@arm.com>
diff --git a/src/armnn/Network.cpp b/src/armnn/Network.cpp
index c5dfbd7..6dbd461 100644
--- a/src/armnn/Network.cpp
+++ b/src/armnn/Network.cpp
@@ -935,6 +935,11 @@
     return m_Graph->AddLayer<QuantizeLayer>(name);
 }
 
+IConnectableLayer* Network::AddDequantizeLayer(const char* name)
+{
+    return m_Graph->AddLayer<DequantizeLayer>(name);
+}
+
 IConnectableLayer* Network::AddStridedSliceLayer(const StridedSliceDescriptor& stridedSliceDescriptor,
                                                  const char* name)
 {