This PR fixes an issue where the Google Play Store would complain that this library was bundling non 16KB page aligned .so files.

Specifically

• base/lib/x86_64/libtensorflowlite_gpu_jni.so
• base/lib/x86_64/libtensorflowlite_jni.so

v1.4.0 of the litert fixes that without requiring a major update to v2.
google-ai-edge/LiteRT#43

Simply updating the dependency version wasn't enough because the directory structure of litert changes from 1.0.1 to 1.4.0

You can see that by going to maven and downloading and unzipping the 1.0.1 AAR and 1.4.0 AAR.

1.0.1 directory structure

headers/
--tensorflow/
----lite/

1.4.0 directory structure

headers/
--external/
----org_tensorflow/
----tensorflow/
--tflite/

This change in directory structure requires updated imports in this projects cpp files. from #include <tensorflow/lite to #include <tflite

There was also an issue with the internal litert cpp files not linking correctly because of the extra external/org_tensorflow/tensorflow path and the way this project copies over header files. I modified the gradle script to copy tensorflow up two levels

so this: turns into
headers/
--external/
----org_tensorflow/
----tensorflow/
--tflite/

this
headers/
--tensorflow/
--tflite/