Add new user-to-kernel interface for Bluetooth low power mode control (1/2)

The bluesleep kernel module was used in Tegra3 platform to perform Bluetooth
low power wakelock and interrup control. Add new user-to-kernel interface
through proc fs nodes for Bluedroid to feed bluesleep with the HCI_DEV events
which bluesleep was monitoring on.

bug 7347413

Change-Id: I791be1042d5573e5207aa81e3d59fa418134f9fe

17 files changed