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