Use paths to determine build targets for treble_build am: ca63627bbe am: 54176d5cbb

Original change: https://android-review.googlesource.com/c/platform/tools/treble/+/2132556

Change-Id: Id41a3befbbeef9efa3782369503b4fa107dc165f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>