cpufreq: zzmoove governor v0.5.1b

Changelog:

- highly optimised scaling logic (thx and credits to Yank555)
- simplified some tuneables by using already available stuff instead of using redundant code (thx Yank555)
- reduced/optimised hotplug logic and preperation for automatic detection of available cores
  (maybe this fixes also the scaling/core stuck problems)
- finally fixed the freezing issue on governor stop!