latona: changes for ondemandboost

Set ondemandboost on boot to set the default boostfreq and then
set ondemand as default governor.
init: set svnet permissions

Needed for DeviceParts
DeviceParts: svent wakelock control
Revert "latona: fix UMS issues"

This workaround is no more required.

This reverts commit 206f6a1c0b9f7bff9cb43329daa939f49b1753f5.
Increase PVR parameter buffer size

The default of 2 MB is far too small for the complex OpenGL rendering
used in the Android UI in ICS and up.  Instead, boost the param buffer
size to 12 MB, which improves performance.

XXX TODO: http://processors.wiki.ti.com/index.php/SGXDbg recommends 16
MB or larger, but this causes SurfaceFlinger to crash and burn.