soc/intel: Use config_of_path(SA_DEVFN_ROOT)

We do not want to disguise somewhat complex function
calls as simple macros.

Change-Id: I53324603c9ece1334c6e09d51338084166f7a585
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34299
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: David Guckian
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/cannonlake/chip.c b/src/soc/intel/cannonlake/chip.c
index faddbd5..4e0dba5 100644
--- a/src/soc/intel/cannonlake/chip.c
+++ b/src/soc/intel/cannonlake/chip.c
@@ -170,12 +170,7 @@
 static void soc_fill_gpio_pm_configuration(void)
 {
 	uint8_t value[TOTAL_GPIO_COMM];
-	const struct device *dev;
-	dev = pcidev_on_root(SA_DEV_SLOT_ROOT, 0);
-	if (!dev || !dev->chip_info)
-		return;
-
-	const config_t *config = dev->chip_info;
+	const config_t *config = config_of_path(SA_DEVFN_ROOT);
 
 	if (config->gpio_override_pm)
 		memcpy(value, config->gpio_pm, sizeof(uint8_t) *