Add event log tag for hidden API access logging.

This new event is logged by ART when hidden API accesses are detected.

Test: m
Test: $ adb lolcat -b events
Bug: 64382372
Bug: 77517571
Merged-In: I5ebb1424d83686dade0d34b118944b0c4c0c7bb1
Change-Id: I5ebb1424d83686dade0d34b118944b0c4c0c7bb1
(cherry picked from commit 8ec1c7ea)