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

In commit ceae98f20e36 ("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>
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index f01972e..07809f4 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -1038,7 +1038,7 @@
 
 		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 {