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/backendsCommon/common.mk b/src/backends/backendsCommon/common.mk
index ba55180..09783ee 100644
--- a/src/backends/backendsCommon/common.mk
+++ b/src/backends/backendsCommon/common.mk
@@ -64,6 +64,7 @@
     test/layerTests/MaximumTestImpl.cpp \
     test/layerTests/MinimumTestImpl.cpp \
     test/layerTests/MultiplicationTestImpl.cpp \
+    test/layerTests/NegTestImpl.cpp \
     test/layerTests/NormalizationTestImpl.cpp \
     test/layerTests/PadTestImpl.cpp \
     test/layerTests/Pooling2dTestImpl.cpp \