Don't set stem. am: 4fa0c705b0 am: 0b59e9b183 am: 2a2a9e965b

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/ash/+/2821840

Change-Id: I8879f6de2815f352b53790a699df83eff26838d5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>