Move test_mainline_modules to AndroidTest.xml

When an AndroidTest.xml is used, configuration needs to be in the
AndroidTest.xml file, not in the Android.bp.

This currently causes tests not to be run in TEST_MAPPING as they should
be.

Test: TH needs to test
Bug: 187935317
Original-Change: https://android-review.googlesource.com/1748157
Merged-In: Ie0aca0c64646825175769cd375bcecf65de4b4c8
Change-Id: Ie0aca0c64646825175769cd375bcecf65de4b4c8
2 files changed