cpufreq: add generic get_cpuidle_time

Easier to maintain this in one place.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
mach-msm: disable kernel-side mpdecision

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
arm: add own hotplug driver

Simple SMP hotplug driver, based on @franciscofranco implementation.

For now without the suspend/resume logic, since this needs
to be redone.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>