soc/intel: Use config_of()

Change-Id: I0727a6b327410197cf32f598d1312737744386b3
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34328
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: David Guckian
diff --git a/src/soc/intel/broadwell/serialio.c b/src/soc/intel/broadwell/serialio.c
index 12e458c..161c875 100644
--- a/src/soc/intel/broadwell/serialio.c
+++ b/src/soc/intel/broadwell/serialio.c
@@ -170,7 +170,7 @@
 
 static void serialio_init(struct device *dev)
 {
-	config_t *config = dev->chip_info;
+	config_t *config = config_of(dev);
 	struct resource *bar0, *bar1;
 	int sio_index = -1;
 	u32 reg32;