IVGCVSW-2054: BATCH_TO_SPACE_ND Reference implementation and Unit tests.

Change-Id: I13c6728dbb60643d0e086d171225c5d802987f92
diff --git a/src/backends/reference/backend.mk b/src/backends/reference/backend.mk
index cc8c24f..7d56144 100644
--- a/src/backends/reference/backend.mk
+++ b/src/backends/reference/backend.mk
@@ -13,6 +13,7 @@
         RefWorkloadFactory.cpp \
         workloads/Activation.cpp \
         workloads/ArithmeticFunction.cpp \
+        workloads/BatchToSpaceNd.cpp \
         workloads/Broadcast.cpp \
         workloads/ConvImpl.cpp \
         workloads/FullyConnected.cpp \
@@ -25,6 +26,8 @@
         workloads/RefBaseConstantWorkload.cpp \
         workloads/RefBatchNormalizationFloat32Workload.cpp \
         workloads/RefBatchNormalizationUint8Workload.cpp \
+        workloads/RefBatchToSpaceNdFloat32Workload.cpp \
+        workloads/RefBatchToSpaceNdUint8Workload.cpp \
         workloads/RefConstantFloat32Workload.cpp \
         workloads/RefConstantUint8Workload.cpp \
         workloads/RefConvertFp16ToFp32Workload.cpp \