msm-core: Supplement scheduler core selection using power estimates

The msm-core driver provides per-core temperature and power for every
P-state (frequency/capacity) to the scheduler.
The objective of the driver is to compute the power consumed
at every P-state so as to make power efficient scheduling decisions.
     Dynamic power = fn (V, f)
     where V is voltage at the frequency f

The power computation and temperature read for all cores happen at
regular intervals (deferrable) unless there is a change in temperature
or frequency.

Change-Id: I2737145955d23e0dfbfabc134ce3e1e73c3e36a1
Signed-off-by: Archana Sathyakumar <asathyak@codeaurora.org>