console: Use single driver entry for UARTs

UARTs now have unified prototypes and can use a single entry
in the list of drivers for ramstage.

Change-Id: I315daaf9a83cfa60f1a270146c729907a1d6d45b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5308
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/include/console/uart.h

@@ -20,6 +20,8 @@
 #ifndef CONSOLE_UART_H
 #define CONSOLE_UART_H
 
+#include <stdint.h>
+
 /* Return the clock frequency UART uses as reference clock for
  * baudrate generator. */
 unsigned int uart_platform_refclk(void);