Bluetooth: bluesleep: cleanup presto changes

Change-Id: I8eedfde942a07a5d797c42ba0389ac2ec7e12d61
Bluetooth: bluesleep: add specific presto driver

The file is a duplicate of the original Pantech driver

Change-Id: Icf462620e1ced2e53e180f0762fd9bdd33b5095b
presto: defconfig: Enable bluesleep for Bluetooth.

For me is best not force any feature, and include this option depending of defconfig, in this way we can test other changes in original files.

Change-Id: I3be998579a6e5b917e8291094b5a41ba5378cb80