Merge "Clean up rust_test_host TEST_MAPPING after default update" am: 8e7b3701dc am: 741136111a

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cexpr/+/1590594

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I3c0e5cd61d6a41c95cc97de3e1117869a8a874b0