prebuilt: apns-conf-cdma.xml: Fix Sprint APNs and clean up APNs for test SIM cards

- Add back and fix Sprint APN for 1x/HRPD. Corrects MMS settings and gives a
suitable APN for DcTracker to use for HRPD/EvDo.
- Remove All test SIM APNs. Since no one is running around with a test SIM and
its useless to have a bunch of APNs sharing the same MCC MNC pair.

Change-Id: I1ccbed9b3cdd456e97d205d70bf283785122de8c
Allow 'system' user to modify cpufreq control files

This is needed by new CPU Settings in CMParts

Change-Id: I0ec4e0b1705670034a433df549b2895985c476af
init: provide initial pemissions for ondemand governor

also set all governor permissions a bit late

Change-Id: I5c1445b31bcaf34a535efd7438fd612ada460ea2
rootdir: Set permissions for additional interactive sysfs nodes

Change-Id: I2dbcdcc199c5f75d08e8ebf41cd6768c7648e27b