mmc: mediatek: Change signal voltage error to dev_dbg()

In commit ceae98f2 ("mmc: core: Try other signal levels
during power up") we can see that there are times when it's
valid to try several signal voltages.  Don't print an ugly
error in the logs when that happens.
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/mtk-sd.c

@@ -1038,7 +1038,7 @@ static int msdc_ops_switch_volt(struct mmc_host *mmc, struct mmc_ios *ios)
 
 		ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
 		if (ret) {
-			dev_err(host->dev,
+			dev_dbg(host->dev,
 					"Regulator set error %d: %d - %d\n",
 					ret, min_uv, max_uv);
 		} else {