Migrate to cargo_embargo. am: 23655b5905 am: ea6b1b57ec am: 661e4a3a66

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/merge/+/2796418

Change-Id: I127e72ff9900463ef87ed132a7b2e95ff54c5725
Signed-off-by: Automerger Merge Worker <[email protected]>