Migrate to cargo_embargo. am: 6fd24aae90 am: b4f83899c6 am: 1c64c60b55

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/either/+/2796179

Change-Id: I72aae4dfb2c7b7dfc96e0b58f15b3d1ad402c237
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>