Disable unused Python 2 variant. am: 0bfaa056f5 am: c1c8a43433 am: ccebb30b31

Original change: https://android-review.googlesource.com/c/platform/external/python/pyasn1-modules/+/2221333

Change-Id: Iee107244171500e682c29406697622fc1e94cd9a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>