IVGCVSW-2915 Add Merge Layer and no-op factory method

Change-Id: I54549671e0d3b207904cf9796a843eb2b0a631f7
Signed-off-by: Nattapat Chaimanowong <nattapat.chaimanowong@arm.com>
diff --git a/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp b/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp
index 26fb03f..0588607 100644
--- a/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp
+++ b/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp
@@ -362,6 +362,8 @@
 
 DECLARE_LAYER_POLICY_2_PARAM(Mean)
 
+DECLARE_LAYER_POLICY_1_PARAM(Merge)
+
 DECLARE_LAYER_POLICY_2_PARAM(Merger)
 
 DECLARE_LAYER_POLICY_1_PARAM(Minimum)