IVGCVSW-6509 Front End + Reference Workload implementation

Subtask of story: IVGCVSW-6164 Add a Pooling3d FrontEnd and Ref Implementation

* Add front end
* Add reference workload
* Add corresponding unit tests

Change-Id: Icce4146dd0a06a1da46a2def00a82d343e171750
Signed-off-by: Tamas Nyiri <tamas.nyiri@arm.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d6f663..3653740 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -305,6 +305,8 @@
     src/armnn/layers/PermuteLayer.cpp
     src/armnn/layers/Pooling2dLayer.hpp
     src/armnn/layers/Pooling2dLayer.cpp
+    src/armnn/layers/Pooling3dLayer.hpp
+    src/armnn/layers/Pooling3dLayer.cpp
     src/armnn/layers/QuantizeLayer.cpp
     src/armnn/layers/QuantizeLayer.hpp
     src/armnn/layers/QLstmLayer.hpp