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

This reverts commit d4dfa684941a21314b70593d01b0fc2167eebad4.

Change-Id: Id61ce69215505c3cf5d30ec2a7ec9127fb2554fc
diff --git a/src/backends/reference/RefLayerSupport.cpp b/src/backends/reference/RefLayerSupport.cpp
index 1e8fa75..629903e 100644
--- a/src/backends/reference/RefLayerSupport.cpp
+++ b/src/backends/reference/RefLayerSupport.cpp
@@ -31,7 +31,7 @@
 static StaticRegistryInitializer<LayerSupportRegistry> g_RegisterHelper{
     LayerSupportRegistryInstance(),
     RefBackendId(),
-    [](const EmptyInitializer&)
+    []()
     {
         return GetLayerSupportPointer();
     }