drm/exynos: dp: Lower level of EDID read success message

Don't pollute the dmesg with EDID read success message as an error.
Printing as debug should be fine.
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_dp_core.c

@@ -195,7 +195,7 @@ static int exynos_dp_read_edid(struct exynos_dp_device *dp)
 		}
 	}
 
-	dev_err(dp->dev, "EDID Read success!\n");
+	dev_dbg(dp->dev, "EDID Read success!\n");
 	return 0;
 }