IVGCVSW-4210 Create a public API for the common backend files

 * Create a public API for the common backend files
 * Move OutputHandler to armnn internal
 * Remove unused headers

Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
Signed-off-by: Narumol Prangnawarat <narumol.prangnawarat@arm.com>
Change-Id: I3e86d908b021e3561befa9d45158d87d2cbb18c0
diff --git a/src/backends/cl/ClTensorHandleFactory.hpp b/src/backends/cl/ClTensorHandleFactory.hpp
index f0d427a..aab3faa 100644
--- a/src/backends/cl/ClTensorHandleFactory.hpp
+++ b/src/backends/cl/ClTensorHandleFactory.hpp
@@ -4,9 +4,9 @@
 //
 #pragma once
 
-#include <backendsCommon/ITensorHandleFactory.hpp>
+#include <armnn/backends/ITensorHandleFactory.hpp>
 #include <aclCommon/BaseMemoryManager.hpp>
-#include <backendsCommon/IMemoryManager.hpp>
+#include <armnn/backends/IMemoryManager.hpp>
 #include <armnn/MemorySources.hpp>
 
 namespace armnn