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

Change-Id: I558a9a007604afc55e536d877f8da7d0215cc9c3
diff --git a/src/backends/aclCommon/common.cmake b/src/backends/aclCommon/common.cmake
index d9d035f..89be236 100644
--- a/src/backends/aclCommon/common.cmake
+++ b/src/backends/aclCommon/common.cmake
@@ -6,4 +6,5 @@
 if(ARMCOMPUTENEON OR ARMCOMPUTECL)
     add_subdirectory(${PROJECT_SOURCE_DIR}/src/backends/aclCommon)
     list(APPEND armnnLibraries armnnAclCommon)
+    list(APPEND armnnUnitTestLibraries armnnAclCommonUnitTests)
 endif()