cpufreq: cpufreq-dt: adjust message related to regulators

The cpufreq-dt driver tries to get a regulator for each CPU. This
regulator is optional, but when not present, a scary message "failed
to get cpuX regulator" is displayed. To solve this, we reduce the
severity of the message from dev_warn() to dev_dbg() and we reword the
message to not be as scary.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq-dt.c

@@ -147,8 +147,8 @@ static int allocate_resources(int cpu, struct device **cdev,
 			goto try_again;
 		}
 
-		dev_warn(cpu_dev, "failed to get cpu%d regulator: %ld\n",
-			 cpu, PTR_ERR(cpu_reg));
+		dev_dbg(cpu_dev, "no regulator for cpu%d: %ld\n",
+			cpu, PTR_ERR(cpu_reg));
 	}
 
 	cpu_clk = clk_get(cpu_dev, NULL);