Clean up rust_test_host TEST_MAPPING after default update am: 798305ad56 am: 7dc4e4cf1b am: 7c19bf11eb

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I6a7d06c4b1d9daa6b8537fe8b6f4424eb774f491