Update TEST_MAPPING am: 98fd603a13

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/memchr/+/2411491

Change-Id: Ieaf527d137d97b563f71d3b18668ad97b8b99cff
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>