Bluetooth:Handling Connect request in AudioOn state.

While in active call, connected to the first BT HS, when we
initiate connection to a second BT HS, connection was not
happening because of which the call audio was routing to the
speaker. Added Connect message handling in the AudioOn state.

Change-Id: I3d9f4265aa2cfddf141ac60f7da82fabfd4bc383
CRs-Fixed: 534731