exynos: video: Correct debug output

We should not print a message from the driver when the display is set up.
This is normal behaviour. Change this message to use debug().

Also remove the double newline on another debug message.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/exynos_dp.c b/drivers/video/exynos_dp.c
index f60b060..c3f7a3a 100644
--- a/drivers/video/exynos_dp.c
+++ b/drivers/video/exynos_dp.c
@@ -967,7 +967,7 @@
 		return ret;
 	}
 
-	printf("Exynos DP init done\n");
+	debug("Exynos DP init done\n");
 
 	return ret;
 }