cpufreq: qcom-hw: register with Energy Model framework

To be able to use Energy Model based on values supplied in DT
for "dynamic-power-coefficient" property, need to register with
Energy Model framework. This is to make placement decisions
based on Energy Model by Energy Aware Scheduler (EAS).

Change-Id: Iecc5c12bec2bf5e50d405cf43b501537274249df
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>