Track zic 2019a update in system/timezone

After the zic version 2019a update in system/timezone we can
be sure of the behavior and eliminate the "accept A or B" type
assertions added during the zic change-over.

Testing:

Ran CtsLibcoreTestCases with old zic data via CTS

Reran affected tests with new zic data:
atest CtsLibcoreTestCases:libcore.java.util.DateTest
atest CtsLibcoreTestCases:libcore.java.util.TimeZoneTest

Bug: 118835133
Bug: 73719425
Bug: 129926912
Test: See above
Change-Id: I5d12af0312aa3d61253f44f41f7ff90c774803bb
2 files changed