Update TEST_MAPPING am: 326ed7bf31

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/fallible-streaming-iterator/+/2108427

Change-Id: I386ce31961f763962cc32e0130356ed76f2fa06d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>