mmc: block: shut up "retrying because a re-tune was needed" message

Re-tuning is part of standard requirements for the higher speed SD
card protocols, and is not an error when this occurs.  When we retry
a command due to a retune, we should not print a message to the
kernel log.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/card/block.c

@@ -1362,8 +1362,8 @@ static int mmc_blk_err_check(struct mmc_card *card,
 
 	if (brq->data.error) {
 		if (need_retune && !brq->retune_retry_done) {
-			pr_info("%s: retrying because a re-tune was needed\n",
-				req->rq_disk->disk_name);
+			pr_debug("%s: retrying because a re-tune was needed\n",
+				 req->rq_disk->disk_name);
 			brq->retune_retry_done = 1;
 			return MMC_BLK_RETRY;
 		}