Add aarch64-linux-musl configurations for cpython2 am: f78b0c41fd

Original change: https://android-review.googlesource.com/c/platform/external/python/cpython2/+/2159996

Change-Id: Ia72ce11dd10b16ad1699bd3908cf11102df603eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>