cpufreq: qcom-hw: Register an Energy Model

Try and register an Energy Model from qcom-cpufreq-hw to allow
interested sub-systems like the task scheduler to use the provided
information.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
[ Viresh: Rebased over cpufreq related changes ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/qcom-cpufreq-hw.c

@@ -231,6 +231,8 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 		goto error;
 	}
 
+	dev_pm_opp_of_register_em(policy->cpus);
+
 	policy->fast_switch_possible = true;
 
 	return 0;