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/docs/Doxyfile b/docs/Doxyfile
index 0c0b3e0..ee75769 100644
--- a/docs/Doxyfile
+++ b/docs/Doxyfile
@@ -822,7 +822,9 @@
                          ./include/ \
                          ./src/ \
                          ./tests/ \
-                         ./docs/
+                         ./docs/ \
+                         ./delegate/include \
+                         ./delegate/src/armnn_external_delegate.cpp
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses