IVGCVSW-1913: Fix for ValidationTest.concat_float_3_relaxed

* Added RefPermuteFloat16Workload to serve as a fallback when CL
  does not support the required permute configuration for FP16
* Move Half.hpp to armnnUtils as the utils library should not be
  including private header files from the armnn library

Change-Id: Ibf0f698451e8406f7ed7cce470dab60b6d16361d
diff --git a/src/backends/test/ConvertFp32ToFp16TestImpl.hpp b/src/backends/test/ConvertFp32ToFp16TestImpl.hpp
index 1325b4b..e4698a9 100644
--- a/src/backends/test/ConvertFp32ToFp16TestImpl.hpp
+++ b/src/backends/test/ConvertFp32ToFp16TestImpl.hpp
@@ -8,13 +8,13 @@
 #include <armnn/ArmNN.hpp>
 #include <armnn/Tensor.hpp>
 #include <armnn/TypesUtils.hpp>
+#include <armnnUtils/Half.hpp>
 
 #include <backends/WorkloadInfo.hpp>
 #include <backends/CpuTensorHandle.hpp>
 
 #include <test/TensorHelpers.hpp>
 
-#include <Half.hpp>
 
 LayerTestResult<armnn::Half, 4> SimpleConvertFp32ToFp16Test(armnn::IWorkloadFactory& workloadFactory)
 {
@@ -52,4 +52,4 @@
     CopyDataFromITensorHandle(&ret.output[0][0][0][0], outputHandle.get());
 
     return ret;
-}
\ No newline at end of file
+}