m7: Enable ioctl interface for BT LPM

 * To go with userspace changes
 * BT LPM is now fully working! \o/

Change-Id: I2bc7efaf0bba44528a0e1ead9d0cb1723d5d8290
msm_serial_hs: Separate Broadcom msm_serial_hs implementation

Change-Id: I0c8f8e8ef6c0ead708a505985e037aafdb5b75d4