ARM: dts: msm: Add an energy model for the SDM855 CPUs

The Energy Aware Scheduler (EAS) requires an energy model to be
present in device tree, one that includes capacity and energy
information for cpus and clusters.

Change-Id: I63611647535643ab55b27422a186827a10afeb3a
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>