uart8250mem: Unify calls with generic UART

NOTE: UART base for SMM continues to be broken, as it does not use
the address resource allocator has assigned.

Change-Id: I79f2ca8427a33a3c719adfe277c24dab79a33ef3
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5235
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/include/console/uart.h

@@ -43,8 +43,10 @@ void uart_tx_flush(void);
 unsigned char uart_rx_byte(void);
 int uart_can_rx_byte(void);
 
+unsigned int uart_platform_base(int idx);
 uint32_t uartmem_getbaseaddr(void);
 
 void oxford_init(void);
+void oxford_remap(unsigned int new_base);
 
 #endif /* CONSOLE_UART_H */