Migrate to cargo_embargo. am: 6fd24aae90 am: 35849a4cb8

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

Change-Id: I2843edf10dc3bdf1e4944e879cb616e3a14f02a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>