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/include/uart8250.h

@@ -146,6 +146,7 @@ void uart8250_mem_tx_byte(unsigned base_port, unsigned char data);
 void uart8250_mem_tx_flush(unsigned base_port);
 void uart8250_mem_init(unsigned base_port, unsigned divisor);
 u32 uart_mem_init(void);
+u32 uartmem_getbaseaddr(void);
 
 /* and special init for OXPCIe based cards */
 void oxford_init(void);