cpufreq: add yankdemand governor

Full stock (JB) ondemand governor with changed default tunable values aimed at lower battery consumption
cpufreq: add yankactive governor

Interactive governor with, fow now :

- hispeed_freq defaulting to lower than policy_max (~1.5GHz)
- target_loads increased to 95
- min_sampling time reduced to 20ms
- timer_rate increased to 60ms
- above_hispeed_delay increased to 80ms
cpufreq: update yankactive governor

Interactive governor with these config changes :

- hispeed_freq defaulting to lower than policy_max (1.73GHz, modified)
- target_loads increased to 95
- min_sampling time reduced to 20ms
- above_hispeed_delay increased to 80ms
- timer_rate back to default 20ms (modified)
cpufreq: update yankactive governor

Interactive governor with these config changes :

- hispeed_freq defaulting to lower than policy_max (1.50GHz, modified)
- target_loads increased to 95
- min_sampling time reduced to 20ms
- above_hispeed_delay increased to 80ms
- timer_rate back to default 20ms
cpufreq: update yankactive governor

Interactive governor with these config changes :

- hispeed_freq defaulting to lower than policy_max (1.50GHz, modified)
- target_loads increased to 95
- min_sampling time reduced to 20ms
- above_hispeed_delay increased to 80ms
- timer_rate back to default 20ms (reverted from commit 8bdea6dbfbebb4703d112dd3c38b867ab57cb1b5)
cpufreq: interactiveX V4: limit max freq when screen off

screen_off_max configurable via sysfs - default 2.27ghz