Add build files for pyserial am: 60af8d6614

Original change: https://android-review.googlesource.com/c/platform/external/python/pyserial/+/2112264

Change-Id: Iae73332fca3c4dea568df8af269a6d0da10d345d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>