Variable GPU OC: sysfs interface to cycle through different top gpu speeds (by imoseyon) and set 384 MHz GPU speed as default.

- sysfs control path: /sys/devices/system/cpu/cpu0/cpufreq/gpu_oc
  0 = 307mhz, 1 = 384mhz, 2 = 512mhz

Source: https://github.com/edoko/AirKernel_GN_JB/commit/8f8698154d5424853e814f1b4cb8542a63780c6f

Note boype: Finally got it working properly after examining the code; also slightly adjusted GPU voltages so that the 512 MHz OPP gets a little more current than the 384 MHz OPP.
Fixed RAMDISK to set BLX value properly on boot
Set-up pegasusq hotplugging to work with the tuna's dual-core and tweaked the governor
Tweaks were applied according to this guide: http://forum.xda-developers.com/showpost.php?p=24233103&postcount=3
Enabled TUN support, disabled Serial i/o support; also disabled ondemandx and re-enabled ondemand
We don't really need ondemandx, since it's main advantage over ondemand is the limited cpu freq with screen-off. Since the tuna has global sysfs variable to set screen-off speed, ondemandx is not needed.