DC: performance: cpusettings: rework layout and optimize performance

finally make full use of otto at cpu settings, pipe all through one shell.
this gives a huge performance gain when loading the fragment.
also less superuser calls, less logs.

replace the seekbar with spinners to make it easier to choose the
frequency you want

Change-Id: I24b42de240336443c0aae42d9dde2b6cd009a5de
version: 0.4.0

Change-Id: Ib0fac94dca2444c7bbca36655e95e620737c583c