IVGCVSW-1843 : refactor ClAdditionWorkload and ClSubtractionWorkload

Change-Id: I0ca9f16217f8e32bb57a49b841611f10dabf021a
diff --git a/Android.mk b/Android.mk
index 9c4db74..6f7771c 100644
--- a/Android.mk
+++ b/Android.mk
@@ -45,12 +45,8 @@
         src/armnn/backends/ArmComputeTensorUtils.cpp \
         src/armnn/backends/ClWorkloads/ClActivationFloatWorkload.cpp \
         src/armnn/backends/ClWorkloads/ClActivationUint8Workload.cpp \
-        src/armnn/backends/ClWorkloads/ClAdditionBaseWorkload.cpp \
-        src/armnn/backends/ClWorkloads/ClAdditionFloatWorkload.cpp \
-        src/armnn/backends/ClWorkloads/ClAdditionUint8Workload.cpp \
-        src/armnn/backends/ClWorkloads/ClSubtractionBaseWorkload.cpp \
-        src/armnn/backends/ClWorkloads/ClSubtractionFloatWorkload.cpp \
-        src/armnn/backends/ClWorkloads/ClSubtractionUint8Workload.cpp \
+        src/armnn/backends/ClWorkloads/ClAdditionWorkload.cpp \
+        src/armnn/backends/ClWorkloads/ClSubtractionWorkload.cpp \
         src/armnn/backends/ClWorkloads/ClBaseConstantWorkload.cpp \
         src/armnn/backends/ClWorkloads/ClBatchNormalizationFloatWorkload.cpp \
         src/armnn/backends/ClWorkloads/ClConstantFloatWorkload.cpp \