IVGCVSW-3231 Add reference workload support for SpaceToDepth

* Added reference workload for SpaceToDepth
* Added unit tests for float32 & uint8
* Minor sort refactoring to RefWorkloads.hpp to alphabetical order

Change-Id: I2e01f8101650e2aae102a8a32bc0064f067141ab
Signed-off-by: Keith Davis <keith.davis@arm.com>
diff --git a/src/backends/backendsCommon/test/CMakeLists.txt b/src/backends/backendsCommon/test/CMakeLists.txt
index 7512c89..7819cfe 100644
--- a/src/backends/backendsCommon/test/CMakeLists.txt
+++ b/src/backends/backendsCommon/test/CMakeLists.txt
@@ -44,6 +44,7 @@
     QuantizeTestImpl.hpp
     RuntimeTestImpl.hpp
     SoftmaxTestImpl.hpp
+    SpaceToDepthTestImpl.hpp
     SplitterEndToEndTestImpl.hpp
     SplitterTestImpl.hpp
     StridedSliceTestImpl.hpp