Pie controls: Fix multi-user handling

This commit adds multi user support for pie controls:
* React on user changes
* Respect per user expanded desktop settings

Change-Id: I513b00f2745f309bf21b971f96276da40003b224
privacy guard: Use LocationBlacklist for location filtering

 * Google has built a per-package blacklist into the location service.
 * Let's use this to handle Privacy Guard instead of our one-off code
   which has a bunch of edge cases and can leave apps in a weird state.

Change-Id: I2f2ecd0b75ff51b44b1a6035189355d7bd63eaf4
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_frameworks_base into myjb-next