Add build rules providing timezones prebuilts under /system/etc/tz.

Define modules `tzdata-art-test`, `tzlookup.xml-art-test`, and
`tz_version-art-test` copying timezones prebuilt files into
/system/etc/tz, so that they can be found even if the Runtime APEX is
not available, by setting the environment variable
`ART_TEST_ANDROID_RUNTIME_ROOT` to "/system" on device.

This is a temporary change needed until both the ART Buildbot and
Golem fully support the Runtime APEX.

Test: Rely on the ART Buildbot and Golem.
Bug: 131667225
Bug: 121117762
Bug: 129332183
Bug: 119293618
Bug: 131239046
Change-Id: I1933f06ecb2382c2f51b2ec95419631ea5cf2927
3 files changed