ARM: dts: msm: Add energy model for SM6150

Add energy costs of cpus and clusters for SM6150, which are
used by energy aware scheduler for task placement decision.
Also add cpu's dmips per mhz, which is used as cpu's efficiency.

Change-Id: Ie857c9d58b5d84e13916909f9ae0f8bf03e3bc94
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>