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/reference/workloads/CMakeLists.txt b/src/backends/reference/workloads/CMakeLists.txt
index 57e89fa..47e42f7 100644
--- a/src/backends/reference/workloads/CMakeLists.txt
+++ b/src/backends/reference/workloads/CMakeLists.txt
@@ -15,6 +15,8 @@
     ConvImpl.hpp
     Debug.cpp
     Debug.hpp
+    DetectionPostProcess.cpp
+    DetectionPostProcess.hpp
     ElementwiseFunction.cpp
     ElementwiseFunction.hpp
     FullyConnected.cpp
@@ -60,6 +62,10 @@
     RefDepthwiseConvolution2dFloat32Workload.hpp
     RefDepthwiseConvolution2dUint8Workload.cpp
     RefDepthwiseConvolution2dUint8Workload.hpp
+    RefDetectionPostProcessUint8Workload.cpp
+    RefDetectionPostProcessUint8Workload.hpp
+    RefDetectionPostProcessFloat32Workload.cpp
+    RefDetectionPostProcessFloat32Workload.hpp
     RefFakeQuantizationFloat32Workload.cpp
     RefFakeQuantizationFloat32Workload.hpp
     RefFloorFloat32Workload.cpp