mmc: dw_mmc: print the message for deprecated property

supports-highspeed was deprecated.
If someone use it, we need to notice information for it.
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>

drivers/mmc/host/dw_mmc.c

@@ -2696,8 +2696,10 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
 			return ERR_PTR(ret);
 	}
 
-	if (of_find_property(np, "supports-highspeed", NULL))
+	if (of_find_property(np, "supports-highspeed", NULL)) {
+		dev_info(dev, "supports-highspeed property is deprecated.\n");
 		pdata->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
+	}
 
 	return pdata;
 }