Cleanup cargo2android configs and patches am: c81820344a

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/either/+/2751242

Change-Id: I219296c74baaf99a7f2995dde718882d6aa2fa7e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>