Update Android TZDB from 2020f to 2021a. am: ba1a76e24c am: 2f63f39ac3 am: adf9b88ccd

Original change: https://android-review.googlesource.com/c/platform/system/timezone/+/1561988

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I88eed272ce5dfae0f31d53bb3fd9137d0eb67cd8