IVGCVSW-2557 Ref Workload Implementation for Detection PostProcess

 * implementation of DetectionPostProcessQueueDescriptor validate
 * add Uint8ToFloat32Workload
 * add implementation of Detection PostProcess functionalities
 * add ref workload implemenentation for float and uint8
 * add layer support for Detection PostProcess in ref
 * unit tests

Change-Id: I650461f49edbb3c533d68ef8700377af51bc3592
diff --git a/src/backends/backendsCommon/Workload.hpp b/src/backends/backendsCommon/Workload.hpp
index 4d14adb..7fb26f8 100644
--- a/src/backends/backendsCommon/Workload.hpp
+++ b/src/backends/backendsCommon/Workload.hpp
@@ -187,4 +187,9 @@
                                                     armnn::DataType::Float32,
                                                     armnn::DataType::Float16>;
 
+template <typename QueueDescriptor>
+using Uint8ToFloat32Workload = MultiTypedWorkload<QueueDescriptor,
+                                                  armnn::DataType::QuantisedAsymm8,
+                                                  armnn::DataType::Float32>;
+
 } //namespace armnn