IVGCVSW-3813 Add Unary Elementwise Operation 'NEG' support to the android-nn-driver

* Implemented ClNegWorkload
* Implemented NeonNegWorkload
* Enabled 'NEG' operator on CL and Neon as well as Ref
* Implemented unit tests for 'NEG' operator

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: I3d7a892692716636cae6bdf8ddd238e3d1ea064f
diff --git a/src/backends/cl/workloads/CMakeLists.txt b/src/backends/cl/workloads/CMakeLists.txt
index 17d69b1..3f964eb 100644
--- a/src/backends/cl/workloads/CMakeLists.txt
+++ b/src/backends/cl/workloads/CMakeLists.txt
@@ -54,6 +54,8 @@
     ClMinimumWorkload.hpp
     ClMultiplicationWorkload.cpp
     ClMultiplicationWorkload.hpp
+    ClNegWorkload.cpp
+    ClNegWorkload.hpp
     ClNormalizationFloatWorkload.cpp
     ClNormalizationFloatWorkload.hpp
     ClPadWorkload.cpp