Broadcast ACL disconnected when adapter turned off

Send a ACL disconnected broadcast intent for all connected
devices when turning off the bluetooth adapter.

This intent can be received in the background so that
non-running applications like complication data providers
can track BT connectivity state.

Bug: 149746528
Bug: 199827901
Test: IOP and BCST
Tag: #feature

Change-Id: If20fd40415d438be2201f82a76608a1b6c43a33f
(cherry picked from commit da9f8935a6c75882df9c73ebdcca53396bef05e8)