ANDROID: Separate cpu_scale and energy model setup

Keep the cpu_scale calculation in the arch_topology driver the way it is
done in mainline. This will require appropriate capacity-dmips-mhz
properties in the dt file.

Do the energy model setup completely separate in kernel/sched/energy.c.

This will allow to adapt the non-mainline energy model code more easily.

Change-Id: I51af46e0f588e82512417fd168e25cec90dc9319
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Git-commit: 70b670cc0c97ff350f260b827ca2e18799a57972
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Puja Gupta <pujag@codeaurora.org>