Revert "Add call answered timestamp into call extra"

Revert submission 24315051-cherrypick-cherrypick-call_answered_time-wvoy2t8g9x-lkjoge0zens

Reason for revert: This has caused a performance regression in call answering times.  See b/311076360.

Reverted changes: /q/submissionid:24315051-cherrypick-cherrypick-call_answered_time-wvoy2t8g9x-lkjoge0zens

Change-Id: I758451caf7b896c238c677769ae6af3703f4f687
1 file changed