PM: EM: Add missing newline for the message log

Fix missing newline for the string long in the error code path.
Reviewed-by: Hongyan Xia <hongyan.xia2@arm.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

kernel/power/energy_model.c

@@ -250,7 +250,7 @@ static void em_cpufreq_update_efficiencies(struct device *dev)
 
 	policy = cpufreq_cpu_get(cpumask_first(em_span_cpus(pd)));
 	if (!policy) {
-		dev_warn(dev, "EM: Access to CPUFreq policy failed");
+		dev_warn(dev, "EM: Access to CPUFreq policy failed\n");
 		return;
 	}