cpu: fix wrong min freq path

There was a derp in 9a123b4d38c7a68d8c76bc02710d410de89624e3 which caused always to
set the maxium frequency instead of the minimum.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
cpu: fix random crash with live oc/uc

 * Handle case if frequencies are overclocked really high

 * Show the user the absolute values instead of converted ones

 * Speed up the process by not converting every single thing we have

Signed-off-by: Blechd0se <alex.christ@hotmail.de>