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>

Conflicts:
	drivers/cpufreq/cpufreq_interactive.c
ghost: Configure interactive governor's max_freq_hysteresis

There is slight lag and stutter when navigating through apps, opening and closing apps, etc.
Use max_freq_hysteresis to hopefully stay at policy->max longer to hopefully stop the dropped frames.

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>