hammerhead: Configure cpufreq

* Make ondemand a bit more conservative
* Configure interactive and set as default
* Configure cpu-boost

Change-Id: Ia59413dda08bc81494bcec23a1bf7c2f6dffadd9
hammerhead: Optimize I/O scheduling

noop is already default I/O scheduler.

Change-Id: I206600d91633bc140b4363b026669ba8074d6371