Make bstr available to product and vendor am: 746d719480

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/bstr/+/2476326

Change-Id: I378afe8c81d7f11b6506dd70d94685c6013d758e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>