mainboard: Remove #include early_serial.c from w83977tf boards

These non-ROMCC boards #include the model specific w83977tf Super I/O
romstage component. The generic winbond_early_serial() function serves
well here to further tighten integration into the new Super I/O
framework and drop dependence on #include'ing .c files, leaving only
ROMCC boards.

Change-Id: Ib63c0f29f994c54e6112702506f288535799706c
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5898
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
diff --git a/src/mainboard/asus/p3b-f/romstage.c b/src/mainboard/asus/p3b-f/romstage.c
index 3762948..e7a7f43 100644
--- a/src/mainboard/asus/p3b-f/romstage.c
+++ b/src/mainboard/asus/p3b-f/romstage.c
@@ -30,8 +30,9 @@
 #include "drivers/pc80/udelay_io.c"
 #include "lib/delay.c"
 #include "cpu/x86/bist.h"
+#include <superio/winbond/common/winbond.h>
 /* FIXME: The ASUS P3B-F has a Winbond W83977EF, actually. */
-#include "superio/winbond/w83977tf/early_serial.c"
+#include <superio/winbond/w83977tf/w83977tf.h>
 #include <lib.h>
 
 /* FIXME: The ASUS P3B-F has a Winbond W83977EF, actually. */
@@ -75,8 +76,7 @@
 
 void main(unsigned long bist)
 {
-	/* FIXME: The ASUS P3B-F has a Winbond W83977EF, actually. */
-	w83977tf_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
+	winbond_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
 	console_init();
 	report_bist_failure(bist);