Add cargo2android.json. am: 4d865ffc6d am: 4be89324c9 am: b4bb1c4e3d

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/arc-swap/+/2822374

Change-Id: Ic0a5e484c4619b959f79a734776fec898a91a8a4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>