IVGCVSW-4483 Removes boost::polymorphic_pointer_downcast

 * replace boost::polymorphic_pointer_downcast by PolymorphicPointerDowncast
 * replaced/removed includes

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: I0ef934a3804cf05e4c38dec6c4ec49c76111a302
diff --git a/src/backends/neon/workloads/NeonDepthToSpaceWorkload.cpp b/src/backends/neon/workloads/NeonDepthToSpaceWorkload.cpp
index b30dfcd..12e7d20 100644
--- a/src/backends/neon/workloads/NeonDepthToSpaceWorkload.cpp
+++ b/src/backends/neon/workloads/NeonDepthToSpaceWorkload.cpp
@@ -8,9 +8,9 @@
 #include "NeonWorkloadUtils.hpp"
 
 #include <aclCommon/ArmComputeTensorUtils.hpp>
+#include <armnn/utility/PolymorphicDowncast.hpp>
 
 #include <boost/numeric/conversion/cast.hpp>
-#include <boost/polymorphic_pointer_cast.hpp>
 
 namespace armnn
 {
@@ -39,13 +39,13 @@
     arm_compute::DataLayout aclDataLayout = ConvertDataLayout(m_Data.m_Parameters.m_DataLayout);
 
     arm_compute::ITensor& input =
-        boost::polymorphic_pointer_downcast<IAclTensorHandle>(m_Data.m_Inputs[0])->GetTensor();
+            PolymorphicPointerDowncast<IAclTensorHandle>(m_Data.m_Inputs[0])->GetTensor();
     input.info()->set_data_layout(aclDataLayout);
 
     int32_t blockSize = boost::numeric_cast<int32_t>(desc.m_Parameters.m_BlockSize);
 
     arm_compute::ITensor& output =
-        boost::polymorphic_pointer_downcast<IAclTensorHandle>(m_Data.m_Outputs[0])->GetTensor();
+            PolymorphicPointerDowncast<IAclTensorHandle>(m_Data.m_Outputs[0])->GetTensor();
     output.info()->set_data_layout(aclDataLayout);
 
     m_Layer.configure(&input, &output, blockSize);