mmc: dw_mmc: Don't print data errors

Data errors are completely expected during tuning. Printing them out
is confusing people looking at the kernel logs. They see things like:

[ 3.613296] dwmmc_exynos 12200000.dwmmc0: data error, status 0x00000088

...and they think something is wrong with their hardware.

Remove the printouts. We'll leave it up to a higher level to report
about errors.

Signed-off-by: Doug Anderson <[e-mail]>
Reviewed-by: Alim Akhtar <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

drivers/mmc/host/dw_mmc.c

···
 			data->error = -EIO;
 		}
 
-		dev_err(host->dev, "data error, status 0x%08x\n", status);
+		dev_dbg(host->dev, "data error, status 0x%08x\n", status);
 
 		/*
 		 * After an error, there may be data lingering