init: fixup cpufreq permissions

It is safe to have read permissions for everyone
Also required for the CPU info overlay service

PS3:
add cpu0-cpu3

PS4:
mke this work on at least a few devices :)

Change-Id: I1de067f63121a8a19f29d4e994fbc3bf73054556
Merge remote-tracking branch 'cm/android-4.4' into android-4.4