Extend coreboot table entry for serial ports

Add information about memory mapped/io mapped base addresses.

and fix up libpayload to use the same structures

Signed-off-by: Stefan Reinauer <reinauer@google.com>

Change-Id: I5f7b5eda6063261b9acb7a46310172d4a5471dfb
Reviewed-on: http://review.coreboot.org/261
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/console/uart8250mem_console.c

@@ -28,6 +28,11 @@ static void uartmem_init(void)
 	uart_bar = uart_mem_init();
 }
 
+u32 uartmem_getbaseaddr(void)
+{
+	return uart_bar;
+}
+
 static void uartmem_tx_byte(unsigned char data)
 {
 	if (!uart_bar)