Add DevicePerformanceSettingsHelper

This program will correctly set the frequency and governor on configured cpus
during boot, set thermal_max and restart thermald, using the user preferences.

Change-Id: I64af82402ffa309e3f5c71c1673ac656d39cb1c5
Use CM msm8960 power HAL

Change-Id: Ibfcd310b64817e33aed2c142cf4db573c776fcb9
Add camera wrapper to prepare for camera hacking

For now it makes no functional changes, but it can be used to examine
how the stock camera app talks to camera HAL.
The main goal is to enable ZSL and HDR in the future.

Change-Id: I91f0b2751429099297d328ea39ba325aa65c0c1e
debug.mdpcomp.maxlayer=2 is not needed anymore

Change-Id: I84d98176a3edca435f099ef3924960cc199e1fea