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/Android.mk b/Android.mk
index aa82e49..e39a0e8 100644
--- a/Android.mk
+++ b/Android.mk
@@ -205,6 +205,7 @@
         src/armnn/layers/PadLayer.cpp \
         src/armnn/layers/PermuteLayer.cpp \
         src/armnn/layers/Pooling2dLayer.cpp \
+        src/armnn/layers/Pooling3dLayer.cpp \
         src/armnn/layers/PreCompiledLayer.cpp \
         src/armnn/layers/PreluLayer.cpp \
         src/armnn/layers/QLstmLayer.cpp \