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

This reverts commit e6b2151ce85d698d9aa012b39b3177acf17086c2.
Revert "cpufreq: Add a sync limit to cpu-boost"

This reverts commit c3b36d7cac63738a5f6fd8853054205e15fbc85e.
Revert "cpufreq: Add cpu-boost driver"

This reverts commit 9a6965102caebb3b94ed435f1c8474330d57dfd2.