m8: Update power management

Add back HTC power and performance manager (PnPMgr) and bin thanks to intervigil
Add back thermal-engine throttling
Switch to stock mpdecision (optimized; built with libqc-mpctl static
library, has boost and other functions for increased performance)

Change-Id: I4336b8fcf6cbcd763d38d35abf3d59e2e4a6e7a6