Merge "Re-include btif::stack_manager" into main am: ec94418d

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2844772



Change-Id: Ifa9c748ff1f3f88d2343a6bfd63a43678d5d6607
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>