sunxi: spl: Fix DRAM info printing

The switch to simple_printf was causing the SPL dram info to show as:

DRAM: u MiB

This fixes this by switching from %lu to %d for printing the DRAM size.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Acked-by: NIan Campbell <ijc@hellion.org.uk>

board/sunxi/board.c

@@ -529,7 +529,7 @@ void sunxi_board_init(void)
 #endif
 	printf("DRAM:");
 	ramsize = sunxi_dram_init();
-	printf(" %lu MiB\n", ramsize >> 20);
+	printf(" %d MiB\n", (int)(ramsize >> 20));
 	if (!ramsize)
 		hang();