superio/fintek/f71859: Avoid .c includes

Following the same reasoning as commit
d304331 superio/fintek/f81865f: Avoid .c includes
Clean up the early_serial #include directives in mainboard/romstage code.

Change-Id: I3577ca3f761fb699dc51141a02e1f853bf1f1a21
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5417
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
diff --git a/src/mainboard/iei/kino-780am2-fam10/romstage.c b/src/mainboard/iei/kino-780am2-fam10/romstage.c
index e5e2c57..299ba61 100644
--- a/src/mainboard/iei/kino-780am2-fam10/romstage.c
+++ b/src/mainboard/iei/kino-780am2-fam10/romstage.c
@@ -41,7 +41,7 @@
 #include "northbridge/amd/amdfam10/reset_test.c"
 #include <console/loglevel.h>
 #include "cpu/x86/bist.h"
-#include "superio/fintek/f71859/early_serial.c"
+#include <superio/fintek/f71859/f71859.h>
 #include <cpu/amd/mtrr.h>
 #include "northbridge/amd/amdfam10/setup_resource_map.c"
 #include "southbridge/amd/rs780/early_setup.c"