Merge "Allow merging target files without framework ab_partitions.txt" into main am: 150fbac7

Original change: https://android-review.googlesource.com/c/platform/build/+/2943049



Change-Id: I378f6f4983902a2868c38ab37a793360b0960a78
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>