dlx: Fix Bluetooth sleep bugs
* Switch to HTC's ioctl interface
* Set polarity to low
* Enable two stopbits for serial device
* Underp BT tethering

Change-Id: Iea104d700dd000ea927d4f751fc8c6bb6a0c0a94
dlx: Remove legacy audio flag
* Looks like CM decided against the new HAL

Change-Id: I86b223773373e2896b43a282fab69ec19742fe10