Update update-tzdata.py tool to generate ICU4J data jars

The ICU4J changes are not necessary for use on Android (since
we use the ICU4C .dat file), but updating them ensures that
the .jars in sync with everything else and the jars are currently
required for host tests.

Change-Id: Ie56b31af87e8fbd27a6489af8287e4b6a7be6b8f