IVGCVSW-1900 : CL backend folder structure

* moving backends/ClWorkloads to backends/cl
* and moving pure Cl workload related code to
  backends/cl/workloads

Change-Id: I019a3c6b4da5e7a23074bf03fb057e63199ad129
diff --git a/src/backends/reference/workloads/Merger.hpp b/src/backends/reference/workloads/Merger.hpp
index 867925f..61c1311 100644
--- a/src/backends/reference/workloads/Merger.hpp
+++ b/src/backends/reference/workloads/Merger.hpp
@@ -7,8 +7,7 @@
 
 #include "RefWorkloadUtils.hpp"
 
-#include "backends/WorkloadData.hpp"
-
+#include <backends/WorkloadData.hpp>
 #include <armnn/Tensor.hpp>
 
 namespace armnn