hammerhead: Update GPS parameters

 * Switch to IZat cloud servers, enable GLONASS

Change-Id: Ia587d776e281bd0febef7ae7e549c7e0f22e2db9
hammerhead: Update permissions for mpdecision

* Allow communication with thermald socket
* Remove global access to /data
  (thanks for the free review, Nick)
* Allow mediaserver to communicate with mpdecision socket

Change-Id: Ib9fd494e7e7a1634b305996b99993e04033cf3ec
hammerhead: Cleanup SELinux policy

This addresses reviews in:

http://review.cyanogenmod.org/#/c/78600/
http://review.cyanogenmod.org/#/c/77883/

Change-Id: I0813085b20e16c2d62c72a8a43ae5f00200bdd77