Add fp16 support for dequantize

* Changed RefDequantizeWorkload to use Encoder/Decoder
* Added related unit tests for Cl, Neon and Ref

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: Ic2fd4103090dd2127c6859b49305736f7b2dfb05
diff --git a/src/backends/reference/workloads/Dequantize.hpp b/src/backends/reference/workloads/Dequantize.hpp
new file mode 100644
index 0000000..c01b454
--- /dev/null
+++ b/src/backends/reference/workloads/Dequantize.hpp
@@ -0,0 +1,20 @@
+//
+// Copyright © 2019 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include <armnn/Tensor.hpp>
+#include "Encoders.hpp"
+#include "Decoders.hpp"
+
+namespace armnn
+{
+
+void Dequantize(Decoder<float>& inputDecoder,
+                Encoder<float>& outputEncoder,
+                const TensorInfo& inputInfo,
+                const TensorInfo& outputInfo);
+
+} //namespace armnn