mainboard/tyan/s8226: Remove redundant sio header

Change-Id: I8d258c12d03e71fb525251104b4fa81596ad2187
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5599
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
diff --git a/src/mainboard/tyan/s8226/romstage.c b/src/mainboard/tyan/s8226/romstage.c
index d0b00b3..fc239e4 100644
--- a/src/mainboard/tyan/s8226/romstage.c
+++ b/src/mainboard/tyan/s8226/romstage.c
@@ -31,7 +31,6 @@
 #include "northbridge/amd/agesa/family10/reset_test.h"
 #include <nb_cimx.h>
 #include <sb_cimx.h>
-#include "superio/nuvoton/wpcm450/wpcm450.h"
 #include <superio/winbond/common/winbond.h>
 #include <superio/winbond/w83627dhg/w83627dhg.h>
 #include "src/drivers/pc80/i8254.c"