Make gdbstub_arch available to product and vendor am: ead7154839 am: 6ca843d1e8 am: a6c699bf79 am: e404df20d5

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/gdbstub_arch/+/2475770

Change-Id: Id7db31a265d270a670881a502807f1e6446925ee
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>