HFP Client connect Audio

Listen for incomming SCO connections any time the Hands Free Profile is
connected to a phone.  Additionally allow eSCO connections on devices
that only support the standard SBC audio codec.

Bug: 62086689
Test: pair and connect a phone via HFP then start a phonecall and
enable and disable audio routing through BT observe that the connection
is established everytime.

Change-Id: I11319a4a85f8c9d36114a6fc09da0f0b8da16672