Vendor: Add Permissions Management to AOKP [2/4]

This is so that the Permissions Management package gets added to each device build.

Change-Id: Ic10eb8d64805c9c4f7b2ae4cd75fede7c7ea80a0
Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>
[2/3] Install persistence support

Add persist.sh to save and restore data across installs.  Initial data
includes property ro.sf.lcd_density and file etc/hosts.  Behavior is
controlled via configuration file etc/persist.conf.

Change-Id: I946d620e06a8dc63a6abec862a7517f8b458f2d1
cooper: switched to aokp/common, instead of mini