Handle `--android-tzdata-root` in `test/run-test`.

This was missing from previous CLs and prevented
`test/testrunner/testrunner.py` from passing a custom TZ data root to
ART run-tests (via `test/etc/run-test-jar`).

Test: Set `ART_TEST_ANDROID_TZDATA_ROOT` to "/system/etc/tzdata_module"
      and run ART run-tests using `art/test/testrunner/testrunner.py` on
      device within the chroot environment.
Bug: b/132169989
Bug: b/121117762
Bug: b/119293618

Change-Id: Ia669af6e6fc6c2c8fa57e557fc3a90065166d1ac
1 file changed