Revert "cpufreq: Add simple userspace CPU-boost driver"

This reverts commit 274798a13dafe74580e6f8920e9b6dd4c7bbfe42.
Revert "cpufreq: Disable cpu-boost"

This reverts commit 9a78eb28ae7de82010757cba2ab3e40e7e00f815.
Revert "hammerhead_defconfig: Enable userspace cpu-boost"

This reverts commit 538b5306b79183b984cd0bfe0783121fa2d60aa4.