GitHub #292 Move BackendRegistry.hpp to the public API

 * Moved to BackendRegistry.hpp include/armnn
 * Updated makefiles and sources accordingly

Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
Change-Id: I4d83abb581d523218a880c879fcf30c9611f7fd7
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 005650f..b66ed5f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -214,6 +214,7 @@
     include/armnn/ArmNN.hpp
     include/armnn/BackendHelper.hpp
     include/armnn/BackendId.hpp
+    include/armnn/BackendRegistry.hpp
     include/armnn/Conversion.hpp
     include/armnn/Deprecated.hpp
     include/armnn/Descriptors.hpp
@@ -355,6 +356,7 @@
     src/armnn/layers/SwitchLayer.hpp
     src/armnn/layers/TransposeConvolution2dLayer.cpp
     src/armnn/layers/TransposeConvolution2dLayer.hpp
+    src/armnn/BackendRegistry.cpp
     src/armnn/BackendSettings.hpp
     src/armnn/BackendHelper.cpp
     src/armnn/CompatibleTypes.hpp