Move libcore/tzdata files to system/timezone

Move libcore/tzdata/share2 and libcore/tzdata/tools2 files
to system/timezone/distro.

Bug: 31008728
Test: mmm system/timezone/distro
Test: make droid / boot device
Test: Ran distro/tools/createTimeZoneDistro.sh with test properties
Test: Ran distro/tools/testing/prepareTzDataUpdates.sh
Merged-In: I2600dd4bee22a571b9eb7303733591b60d1a8b2a
Change-Id: I2600dd4bee22a571b9eb7303733591b60d1a8b2a