Migrate to cargo_embargo. am: efbeffa602

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/gdbstub_arch/+/2823090

Change-Id: I2ca19eeb36a8e1c884cf1a16ab35b6aa755ad394
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>