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/NeonBatchToSpaceNdWorkload.cpp b/src/backends/neon/workloads/NeonBatchToSpaceNdWorkload.cpp
index a6e7aa4..d2f5387 100644
--- a/src/backends/neon/workloads/NeonBatchToSpaceNdWorkload.cpp
+++ b/src/backends/neon/workloads/NeonBatchToSpaceNdWorkload.cpp
@@ -6,6 +6,8 @@
 #include "NeonBatchToSpaceNdWorkload.hpp"
 
 #include "NeonWorkloadUtils.hpp"
+
+#include <armnn/utility/PolymorphicDowncast.hpp>
 #include <ResolveType.hpp>
 
 namespace armnn
@@ -38,9 +40,9 @@
     m_Data.ValidateInputsOutputs("NeonBatchToSpaceNdWorkload", 1, 1);
 
     arm_compute::ITensor& input  =
-            boost::polymorphic_pointer_downcast<IAclTensorHandle>(m_Data.m_Inputs[0])->GetTensor();
+            armnn::PolymorphicPointerDowncast<IAclTensorHandle>(m_Data.m_Inputs[0])->GetTensor();
     arm_compute::ITensor& output =
-            boost::polymorphic_pointer_downcast<IAclTensorHandle>(m_Data.m_Outputs[0])->GetTensor();
+            armnn::PolymorphicPointerDowncast<IAclTensorHandle>(m_Data.m_Outputs[0])->GetTensor();
 
     arm_compute::DataLayout aclDataLayout = ConvertDataLayout(m_Data.m_Parameters.m_DataLayout);
     input.info()->set_data_layout(aclDataLayout);