IVGCVSW-2056 + IVGCVSW-2064 : move ClContextControl to the ClBackend

Change-Id: Ice19d3f763298bc14585267df389e99df846320d
diff --git a/src/backends/CMakeLists.txt b/src/backends/CMakeLists.txt
index 045bd2a..843e567 100644
--- a/src/backends/CMakeLists.txt
+++ b/src/backends/CMakeLists.txt
@@ -4,11 +4,14 @@
 #
 
 list(APPEND armnnBackendsCommon_sources
+    BackendContextRegistry.cpp
+    BackendContextRegistry.hpp
     BackendRegistry.cpp
     BackendRegistry.hpp
     CpuTensorHandle.cpp
     CpuTensorHandleFwd.hpp
     CpuTensorHandle.hpp
+    IBackendContext.hpp
     IBackendInternal.hpp
     ILayerSupport.cpp
     ITensorHandle.hpp