IVGCVSW-3117 Rename RefMergerWorkload to RefConcatWorkload

Change-Id: Ifeb33db919ef77bf777e114f2d84b88fd595ca2c
Signed-off-by: Jim Flynn <jim.flynn@arm.com>
diff --git a/src/backends/reference/workloads/RefWorkloads.hpp b/src/backends/reference/workloads/RefWorkloads.hpp
index 9a2eb0a..314e65b 100644
--- a/src/backends/reference/workloads/RefWorkloads.hpp
+++ b/src/backends/reference/workloads/RefWorkloads.hpp
@@ -16,7 +16,7 @@
 #include "RefActivationWorkload.hpp"
 #include "RefPooling2dFloat32Workload.hpp"
 #include "RefWorkloadUtils.hpp"
-#include "RefMergerWorkload.hpp"
+#include "RefConcatWorkload.hpp"
 #include "RefFullyConnectedFloat32Workload.hpp"
 #include "RefGatherWorkload.hpp"
 #include "Softmax.hpp"