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

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

Notes for Android time zone maintainers:
Like all tzdb updates, the binary files in this commit should not be
patched to other release branches: they are not guaranteed to work.
Also note that there are associated changes in external/icu and often
others that should also be applied.  tzdb updates are incremental
changes: all previous tzdb updates should be applied.  Look for
aosp/<release>-dev changes for backports. If you have a local branch
with ICU changes the ICU .dat file in external/icu will not apply
cleanly.  Instead, make equivalent changes to text files and run
system/timezone/update-tzdata.py.

--------

IANA TZDB 2021a release notes:
  Briefly:
    South Sudan changes from +03 to +02 on 2021-02-01.

  Changes to future timestamps
    South Sudan changes from +03 to +02 on 2021-02-01 at 00:00.
    (Thanks to Steffen Thorsen.)

Bug: 179024040
Test: CtsLibcoreTestCases
Test: CtsLibcoreOjTestCases
Test: CtsIcuTestCases
Test: CtsBionicTestCases
Test: CtsTextTestCases
Test: Verified version by running 'adb shell dumpsys runtime'
Test: Checked South Sudan in Setting -> Date & Time before
and after 2021a on CF instance.

Merged-In: I659a3413c3c03a981a53d7ec69e7f32063871a59
Change-Id: I659a3413c3c03a981a53d7ec69e7f32063871a59
19 files changed