Add build files for pyserial am: 4745695a5f

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/python/pyserial/+/18802649

Change-Id: I3750b852de3d380a19d26d867f4cff95e23f5266
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>