IVGCVSW-4227 Add CpuAcc backend support for DetectionPostProcess

Change-Id: I318bf92b8d1db593d9c30b9b4412bfecbe65bc12
Signed-off-by: Derek Lamberti <derek.lamberti@arm.com>
diff --git a/src/backends/neon/NeonWorkloadFactory.cpp b/src/backends/neon/NeonWorkloadFactory.cpp
index dd11af4..8d798ec 100644
--- a/src/backends/neon/NeonWorkloadFactory.cpp
+++ b/src/backends/neon/NeonWorkloadFactory.cpp
@@ -205,7 +205,7 @@
 std::unique_ptr<IWorkload> NeonWorkloadFactory::CreateDetectionPostProcess(
     const armnn::DetectionPostProcessQueueDescriptor& descriptor, const armnn::WorkloadInfo& info) const
 {
-    return MakeWorkloadHelper<NullWorkload, NullWorkload>(descriptor, info);
+    return std::make_unique<NeonDetectionPostProcessWorkload>(descriptor, info);
 }
 
 std::unique_ptr<armnn::IWorkload> NeonWorkloadFactory::CreateDivision(