update config
Optimize cpufreq transition latency

This may improve performance of 'ondemand'
a little bit. Patch from the linaro team.
cpufreq: interactive: Add a knob to treat IO wait as busy

The new sysfs node io_is_busy enables the interactive governor to
account any time spent by the CPU waiting for IO as non-idle time.
This helps us improve run-time of IO bound tasks by making up for
lost IO time in speeding up the CPU bound parts of the task.

This also introduces get_cpu_iowait_time_us() and all relevant
code parts of it.
Furthermore improved interactive to be smooth and power efficient.