Migrate to cargo_embargo. am: 4fba66ab76 am: ef9157cc12 am: 7c4dc8ca10

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/gdbstub/+/2841313

Change-Id: Id48ebb7403891fb77a1ee3e46ba6caca35d19cc4
Signed-off-by: Automerger Merge Worker <[email protected]>