Revert "cpu boost: backport missing functions from 3.4 (DerTeufel)"

This reverts commit 17b95f40a87fdcce357a1d97609d4a2ba1c1c2a3.
Revert "cpufreq: Add a sync limit to cpu-boost"

This reverts commit 6334a7fa392cea17831befeb41f44a76ff10d578.
Revert "cpufreq: Add cpu-boost driver"

This reverts commit 12491356a183f416ad596ccdb993c83185586c8d.