Correct annotations in ZoneInfoDb

- Add @Override to close() method bececause ZoneInfoDb implements
  AutoCloseable
- package-private method can't be @IntraCoreApi and should have no
  effect.

Bug: 139480281
Test: m droid
Change-Id: I47c92480674d9cd22ff07c20c4d56e488706b64f
2 files changed