init [1/4]: set permissions on governors sysfs nodes

1. interactive
2. ondemand
3. assume smp uses shared cpufreq policy for all CPUs

also, set permission for boostpulse
it will fix some permission issues like:

E/S5PC110 PowerHAL(  482): Error writing to boostpulse: No such device
E/S5PC110 PowerHAL(  482): Error opening interactive boostpulse interface: Permission denied
E/S5PC110 PowerHAL(  495): Error opening /sys/devices/system/cpu/cpufreq/interactive/timer_rate: Permission denied

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I581aaa1daf2ba5911e89398a4f8a1567fd6569c9
init [2/4]: set permissions on schedulers sysfs nodes

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: Ib7653a008bbeb978ea1bca77cb76ab4e609d48b6
init [3/4]: allow system to modify ksm control files

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: Id4e70992f34c8039c06ab1131b9cc2195f6e3b63
init [4]: set permissions on notify_on_migrate node

 * Used by PowerHAL

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: Ifbf58c145522d82d220fbae39a6b7319971ecbb5