Export BTS library(setupcompat_bts) am: 7cfd1d6501 am: c6f701f9d1

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/setupcompat/+/24053006

Change-Id: I49f20bfbb2ec4fa6e0afccc4af3afd7ce08a1569
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>