Update TEST_MAPPING am: d7bd97eae4

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/smallvec/+/2108153

Change-Id: I59fc628984eb3d02cbf4f1eef2bc7fb2d74a5a0c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>