superio/fintek/f81865f: Avoid .c includes

We should not be #include .c files, instead link early_serial into
romstage and provide a prototype.

Change-Id: Ia9277169ce1592e1fc72f8849f0982741daec567
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5416
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)

src/superio/fintek/f81865f/Makefile.inc

@@ -18,4 +18,5 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 ##
 
+romstage-$(CONFIG_SUPERIO_FINTEK_F81865F) += early_serial.c
 ramstage-$(CONFIG_SUPERIO_FINTEK_F81865F) += superio.c

src/superio/fintek/f81865f/chip.h

@@ -30,4 +30,4 @@ struct superio_fintek_f81865f_config {
 	struct pc_keyboard keyboard;
 };
 
-#endif
+#endif /* SUPERIO_FINTEK_F81865_CHIP_H */

src/superio/fintek/f81865f/early_serial.c

@@ -21,6 +21,7 @@
 /* Pre-RAM driver for the Fintek F81865F/FG Super I/O chip. */
 
 #include <arch/io.h>
+#include <device/pnp.h>
 #include "f81865f.h"
 
 static void pnp_enter_conf_state(device_t dev)
@@ -36,7 +37,7 @@ static void pnp_exit_conf_state(device_t dev)
 	outb(0xaa, port);
 }
 
-static void f81865f_enable_serial(device_t dev, u16 iobase)
+void f81865f_enable_serial(device_t dev, u16 iobase)
 {
 	pnp_enter_conf_state(dev);
 	pnp_set_logical_device(dev);

src/superio/fintek/f81865f/f81865f.h

@@ -35,4 +35,6 @@
 #define	F81865F_GPIO	0x06	/* General Purpose I/O (GPIO) */
 #define	F81865F_PME	0x0a	/* Power Management Events (PME) */
 
-#endif
+void f81865f_enable_serial(device_t dev, u16 iobase);
+
+#endif /* SUPERIO_FINTEK_F81865_F81865_H */