Clean up rust_test_host TEST_MAPPING after default update am: 798305ad56 am: 7dc4e4cf1b

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/lock_api/+/1584205

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7d8fe913e4ead9d5493cd634d14c624aca81d9c2