Move tests to .test package

This will be used for excluding the tests in coverage configs. Also in
general tests should probably be a different package than the apk they
test.

Bug: 135956699
Test: atest CellBroadcastServiceTests
Change-Id: Ib10d694737ffa40c1eee063f8ac789a01dbdc7dd
Merged-In: Ib10d694737ffa40c1eee063f8ac789a01dbdc7dd
14 files changed