Disable unused Python 2 variant. am: 7db25af7a5 am: e3b05970d4

Original change: https://android-review.googlesource.com/c/platform/external/python/pyasn1/+/2221453

Change-Id: I01eb76566fd7f61f0b329570065998d2d59210e1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>