Update TEST_MAPPING am: 5617548afc

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rand_chacha/+/2411617

Change-Id: Ib83a46574b2c0daf595a0657f6483e393fa17b27
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>