favr-32-ezkit: Fix printf format warnings

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
diff --git a/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c b/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c
index 22b6981..da69e75 100644
--- a/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c
+++ b/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c
@@ -75,7 +75,7 @@
 	unmap_physmem(sdram_base, EBI_SDRAM_SIZE);
 
 	if (expected_size != actual_size)
-		printf("Warning: Only %u of %u MiB SDRAM is working\n",
+		printf("Warning: Only %lu of %lu MiB SDRAM is working\n",
 				actual_size >> 20, expected_size >> 20);
 
 	return actual_size;