DO NOT MERGE Track SCO state in HfpClientDeviceBlock, and set SCO

state of both Connections and Conferences whenever they're created,
and when onAudioStateChanged is invoked.

Tag: #stability
Bug: 191206390
Bug: 190404030
Test: atest BluetoothInstrumentationTests
Change-Id: I256a6409c83f45db03052f3f7ee9da8aafb5b817