DO NOT MERGE: Update tzdb version to 2019b

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

Bug: 137178696
Test: See system/timezone
Change-Id: Ibe8cd8f9fb6bd100e6dab315bd44a7dbe214ef54
Merged-In: I2751bda143b6fae32213ae135ed50c87250e8bdb
Merged-In: Ibe8cd8f9fb6bd100e6dab315bd44a7dbe214ef54
(cherry picked from commit 4b673a3d0b6b7382e23c1550d0be31945cb3ef58)
3 files changed