sched/fair: Use load.weight instead of avg.load_avg_contrib

The scheduler in kernel 3.4.y still implements sched_mc_power_savings. This is
basically our equivalent of avg.load_avg_contrib

Signed-off-by: Luis Cruz <ljc2491@gmail.com>
zen-tune: Be more lax instead of aggressive in CFS

The original zen implementation is meant for desktops. Where interactivity
can come at the cost of power effeciency (since most desktops are normally
plugged into an outlet). Instead of making things aggressive in the scheduler,
we should try to calm them down a bit.
Reduces overall context-switches throughout usage.

Signed-off-by: Luis Cruz <ljc2491@gmail.com>
sched: core: Max out sched_mc_power_savings

After some more testing with our cpupower driver, semaphore's ondemand gov,
and power_efficient_workqueues enabled, this only seems to help in keeping
things grouped into one core.

Not only is it capable of doing this... It can do it WELL. No sizable
impact on benchmarks whatsoever.

Signed-off-by: Luis Cruz <ljc2491@gmail.com>