sio/smsc/fdc37n972: add missing pnp_conf_mode field to ops struct

This patch makes it possible to enter the config mode of the super IO chip, so
that changes can be made to the configuration registers.

Change-Id: I7e31eaf217b3af2226c1e7d2f14f2ef7b0d7ddbe
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/27392
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>

src/superio/smsc/fdc37n972/superio.c

@@ -15,6 +15,7 @@
 
 #include <device/device.h>
 #include <device/pnp.h>
+#include <superio/conf_mode.h>
 #include <pc80/keyboard.h>
 #include <stdlib.h>
 
@@ -43,6 +44,7 @@ static struct device_operations ops = {
 	.enable_resources = pnp_enable_resources,
 	.enable           = pnp_enable,
 	.init             = init,
+	.ops_pnp_mode     = &pnp_conf_mode_55_aa,
 };
 
 static struct pnp_info pnp_dev_info[] = {