OPP: Switch to use dev_pm_domain_set_performance_state()

To support performance scaling for any kinds of PM domains, let's move away
from using the genpd specific API, dev_pm_genpd_set_performance_state(), to
the common dev_pm_domain_set_performance_state().

No intended functional impact at this point.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/opp/core.c

@@ -1030,7 +1030,7 @@ static int _set_performance_state(struct device *dev, struct device *pd_dev,
 	if (!pd_dev)
 		return 0;
 
-	ret = dev_pm_genpd_set_performance_state(pd_dev, pstate);
+	ret = dev_pm_domain_set_performance_state(pd_dev, pstate);
 	if (ret) {
 		dev_err(dev, "Failed to set performance state of %s: %d (%d)\n",
 			dev_name(pd_dev), pstate, ret);