uart8250io: Fix build with DEBUG_SMI

Change-Id: I5110af348d22c0abc940f0922854fdd7e0c7e2e9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5574
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/drivers/uart/uart8250io.c

@@ -18,6 +18,7 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <rules.h>
 #include <arch/io.h>
 #include <console/uart.h>
 #include <trace.h>
@@ -134,7 +135,7 @@ void uart_tx_flush(void)
 	uart8250_tx_flush(bases[0]);
 }
 
-#ifndef __PRE_RAM__
+#if ENV_RAMSTAGE
 void uart_fill_lb(void *data)
 {
 	struct lb_serial serial;