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/skylake/chip_fsp20.c b/src/soc/intel/skylake/chip_fsp20.c
index a1fced2..5b61df3 100644
--- a/src/soc/intel/skylake/chip_fsp20.c
+++ b/src/soc/intel/skylake/chip_fsp20.c
@@ -233,15 +233,11 @@
 	FSP_S_CONFIG *params = &supd->FspsConfig;
 	FSP_S_TEST_CONFIG *tconfig = &supd->FspsTestConfig;
 	static struct soc_intel_skylake_config *config;
+	struct device *dev;
 	uintptr_t vbt_data = (uintptr_t)vbt_get();
 	int i;
 
-	struct device *dev = SA_DEV_ROOT;
-	if (!dev || !dev->chip_info) {
-		printk(BIOS_ERR, "BUG! Could not find SOC devicetree config\n");
-		return;
-	}
-	config = dev->chip_info;
+	config = config_of_path(SA_DEVFN_ROOT);
 
 	mainboard_silicon_init_params(params);
 	/* Set PsysPmax if it is available from DT */