Upgrade libtraceevent to libtraceevent-1.7.1

This project was upgraded with external_updater.
Usage: tools/external_updater/updater.sh update libtraceevent
For more info, check https://cs.android.com/android/platform/superproject/+/master:tools/external_updater/README.md

Test: TreeHugger
Change-Id: If05b680336283ce6f5638029e6edde10ef774581