Remove TEST_MAPPING. am: 2a7bbc0cc3 am: 8df52846a9 am: dfb272ea3f

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/buddy_system_allocator/+/2358599

Change-Id: I6490bf0ed3a35e724e40c1baef0bd31b55f7c06c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>