Merge "floss: Unregister a GATT Server in btclient" into main am: a381f571

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2964322



Change-Id: I9e3bd6c9ec2a9d2a1cdcd951172e259ce9f5a73b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>