cpufreq: Revert cpu-boost driver

* This is causing issues on HTC msm8960
* Squash of the following commits:

Revert "cpufreq: Add a sync limit to cpu-boost"

This reverts commit a2c24e623fd6f54c9e825fb29eec0194b2c74ba0.

Revert "cpufreq: Add cpu-boost driver"

This reverts commit bc44b36b3fea9b056cdf3a736de513adfaf25b3e.