Migrate to cargo_embargo. am: 566a910942

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/tinytemplate/+/2828073

Change-Id: I04399731543cee12333854e0e813cf761ed9defd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>