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
(cherry picked from commit d497814f)
Merged-In: Id5b420fe005c76918aa8a57d5ae822ee6a4808c7
Merged-In: If44b7cf697ce3d73c2e65639ab404a364e7a5672