headless: Introduce headless bluetooth properties am: d754f039 am: 473de8cc am: 5c2fc2b8

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2322172



Change-Id: I24aac2776051b2fcc811962785c75e309d1bdc0b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>