cpufreq: interactive: Add max_freq_hysteresis feature

Previously known as sampling down factor, max_freq_hysteresis
extends the period that interactive governor will stay at policy->max.
This feature is to accomodate short idle periods in an otherwise very
intensive workload.

When the feature is enabled, it ensures that once a CPU goes to max
frequency, it doesn't reduce the frequency for max_freq_hysteresis
microseconds from the time it first goes to idle.

Change-Id: Ia54985cb554f63f8c22d0b554a0a0f2ed2be038f
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>

https://github.com/xboxfanj/android_kernel_htc_msm8974/commit/1fd4bf47f4f84e700124ac44727be618ed3b1c5a#diff-1febeaefccfabc82e4dedda8958ef769R521