IVGCVSW-2095 Add reference implementation and unit tests for SpaceToBatchNd

Change-Id: I27ffebdece6e68460931a44c15b9b029f9fce638
diff --git a/src/backends/reference/workloads/RefWorkloads.hpp b/src/backends/reference/workloads/RefWorkloads.hpp
index 14e6699..03907a6 100644
--- a/src/backends/reference/workloads/RefWorkloads.hpp
+++ b/src/backends/reference/workloads/RefWorkloads.hpp
@@ -41,6 +41,7 @@
 #include "BatchNormImpl.hpp"
 #include "Activation.hpp"
 #include "Merger.hpp"
+#include "RefSpaceToBatchNdWorkload.hpp"
 #include "RefSplitterFloat32Workload.hpp"
 #include "RefConstantFloat32Workload.hpp"
 #include "RefActivationFloat32Workload.hpp"