Clean up rust_test_host TEST_MAPPING after default update am: 798305ad56 am: 7dc4e4cf1b am: 7c19bf11eb am: 4c7a86e365

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I61d810f29ed841b2d61ff403236d31844040cc8c