DO NOT MERGE: Update tzdb version to 2019b

Update tzdb version from 2019a to 2019b. See associated change
in system/timezone for details.

Bug: 137343136
Test: See system/timezone change
Merged-In: I2de5591c6eca497b2c534121b8beb1ad4c847e7f
Change-Id: I2de5591c6eca497b2c534121b8beb1ad4c847e7f
(cherry picked from commit f424e8e350d0423fda3fea8b835a2b97dee7d8f2)
3 files changed