cpupower: update the cpu_power according to cpu load

This driver updates the capacity of each core according to current
sched_mc level and cpu frequency (in fact current cpu load)

When the lowest frequencies are used, we are in a light load use case
and we increase the cpu capacity to keep these light tasks on CPU0

Conflicts:

	drivers/staging/Kconfig

Conflicts:
	drivers/staging/Makefile

Signed-off-by: Xmister <xmisterhu@gmail.com>

Conflicts:
	drivers/staging/Makefile

Conflicts:
	drivers/staging/Kconfig
	drivers/staging/Makefile