IVGCVSW-5571 Expose the TfLite Delegate to the TfLite python API

 * Implemented external delegate adaptor interface for TfLite
 * Activated armnn logging for delegate
 * Added logging info to indicate if gpu tuning is turned on
 * Added pytests to ensure functionality of the external delegate adaptor
 * Included the delegate directory into doxygen
 * Added documentation on how to use the external delegate in python

Signed-off-by: Finn Williams <Finn.Williams@arm.com>
Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: Id3b4588fb0b9ac7e3f47ba2c19feead7beb58e18
diff --git a/delegate/CMakeLists.txt b/delegate/CMakeLists.txt
index 8383722..495c1e3 100644
--- a/delegate/CMakeLists.txt
+++ b/delegate/CMakeLists.txt
@@ -15,6 +15,7 @@
         include/armnn_delegate.hpp
         include/DelegateOptions.hpp
         src/armnn_delegate.cpp
+        src/armnn_external_delegate.cpp
         src/DelegateOptions.cpp
         src/Activation.hpp
         src/ArgMinMax.hpp