Disconnect also connecting Bluetooth device

This covers disconnection of connecting device profiles. Once first/lead
device from set is connected there is available disconnection button which
triggers disconnection for group members also. Adapter should be able to
disconnect a connecting device also.

Tag: #feature
Test: atest GoogleBluetoothInstrumentationTests
Bug: 245697292
Change-Id: I05df62893ddff94a56d39639d245f66a12fea58d