Add cargo2android.json. am: 45f103b58e am: e0cfd1ad5c am: f8e6867972

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/toml_datetime/+/2822770

Change-Id: I657e0211d569f0adbe42476c8530286cea63f4c5
Signed-off-by: Automerger Merge Worker <[email protected]>