Move timezone-host library to the com.android.i18n module.

To support it, make art.module.api.annotations available and export it
in art-module-host-exports.

Also clean up the timezone_host_libcore_files filegroup which isn't
used anywhere now.

Test: See https://r.android.com/1495078
Bug: 172480615
Change-Id: I2437c4bd9313732880a8e4046af9e215857aed33
2 files changed