Fix auto-generate-resources.py

- lxml is compatible with python 3.7

Bug: 154244647
Fixes: 164131545
Test: Manually
Change-Id: I4ef7375b555e64ac10f1ec82c8601601d0493c4a
Merged-In: I4ef7375b555e64ac10f1ec82c8601601d0493c4a
4 files changed