added rx support

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1410 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/console/logbuf_console.c

@@ -16,4 +16,6 @@ static void logbuf_tx_byte(unsigned char byte)
 static struct console_driver __console = {
 	.init    = 0,
 	.tx_byte = logbuf_tx_byte,
+	.rx_byte = 0,
+	.tst_byte = 0,
 };}