IVGCVSW-1938: Move backend-specific source files to the corresponding backend

Change-Id: I558a9a007604afc55e536d877f8da7d0215cc9c3
diff --git a/src/backends/aclCommon/CMakeLists.txt b/src/backends/aclCommon/CMakeLists.txt
index 42f9142..6f99f4f 100644
--- a/src/backends/aclCommon/CMakeLists.txt
+++ b/src/backends/aclCommon/CMakeLists.txt
@@ -9,6 +9,8 @@
     ArmComputeUtils.hpp
 )
 
+add_subdirectory(test)
+
 add_library(armnnAclCommon STATIC ${armnnAclCommon_sources})
 target_include_directories(armnnAclCommon PRIVATE ${PROJECT_SOURCE_DIR}/src)
 target_include_directories(armnnAclCommon PRIVATE ${PROJECT_SOURCE_DIR}/src/armnn)