IVGCVSW-3695 Add CL ArgMinMax workload

 * Also enabled copy to/from CL for Signed32.

Signed-off-by: James Conroy <james.conroy@arm.com>
Change-Id: I0113182891f9767de73f04dcd81252c84c996eda
diff --git a/src/backends/cl/workloads/CMakeLists.txt b/src/backends/cl/workloads/CMakeLists.txt
index a9f320d..94c4a3e 100644
--- a/src/backends/cl/workloads/CMakeLists.txt
+++ b/src/backends/cl/workloads/CMakeLists.txt
@@ -10,6 +10,8 @@
     ClActivationWorkload.hpp
     ClAdditionWorkload.cpp
     ClAdditionWorkload.hpp
+    ClArgMinMaxWorkload.cpp
+    ClArgMinMaxWorkload.hpp
     ClBatchNormalizationFloatWorkload.cpp
     ClBatchNormalizationFloatWorkload.hpp
     ClBatchToSpaceNdWorkload.cpp