Merge "Provide a flag library for rust code" into main am: 9670ad20 am: 8d0f6efb

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/3248691



Change-Id: Iad9a75d366e4a38061413803d170259dbb9f7f09
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>