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/RefWorkloads.hpp b/src/backends/reference/workloads/RefWorkloads.hpp
index d9f4dbb..2156388 100644
--- a/src/backends/reference/workloads/RefWorkloads.hpp
+++ b/src/backends/reference/workloads/RefWorkloads.hpp
@@ -38,6 +38,8 @@
 #include "ResizeBilinear.hpp"
 #include "RefNormalizationFloat32Workload.hpp"
 #include "RefDepthwiseConvolution2dFloat32Workload.hpp"
+#include "RefDetectionPostProcessFloat32Workload.hpp"
+#include "RefDetectionPostProcessUint8Workload.hpp"
 #include "RefPooling2dUint8Workload.hpp"
 #include "BatchNormImpl.hpp"
 #include "Activation.hpp"