sepolicy: allow access for perfomance settings

Change-Id: Id8b66ae5bd92ba301b3d652501aa27b0eadb36ea
rootdir: fix path for read_ahead sysfs

Change-Id: Iec934e97a07e393d12806a3286e47b998f994ac2
Merge pull request #2 from omnirom/android-5.0

Android 5.0