Disable unused Python 2 variant. am: 5dfda218df am: 4487a904e1 am: 7b182cd345 am: 0430a8a5a1

Original change: https://android-review.googlesource.com/c/platform/external/python/cryptography/+/2221329

Change-Id: Ib393cccde4ffcf0f8f1bcb649fa4fd44043b02ae
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>