DO NOT MERGE Update Android ICU tzdata from 2020f to 2021a. [R]

Update Android ICU tzdata from 2020f to 2021a. [R]

This change is associated with tzdb 2021a changes in system/timezone.

metaZones.txt and windowsZones.txt are cherry-picked from
https://github.com/unicode-org/icu/commit/7c412f9c8fee27de524fbb6bd8c0b15fb7037a89.

zoneinfo64.txt and binary files are generated as part of running
system/timezone/update-tzdata.py

Bug: 179024040
Test: see tests section in system/timezone
Change-Id: I5711f406953a71764783d345d737bc6bb5390e24
Merged-In: I5711f406953a71764783d345d737bc6bb5390e24
5 files changed