Implemented CPU MAX/MIN Freq Limit control, User Can use non OC kernel!

LG Hotplug and thermal controls reset freq to max all the time.
So to allow user to have 2.3Ghz max for real, this code is needed.

It's based on DVFS from Samsung I9505 kernel, with adaptation.

It's tuned via STweaks in my kernel, but can be tuned via other apps.
or scripts.

interface in /sys/power/cpufreq_max_limit || cpufreq_min_limit

Thanks to @Alucard24 for help and point in right place in code.