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/mainboard/google/poppy/variants/atlas/mainboard.c b/src/mainboard/google/poppy/variants/atlas/mainboard.c
index 07a4e66..d4db98e 100644
--- a/src/mainboard/google/poppy/variants/atlas/mainboard.c
+++ b/src/mainboard/google/poppy/variants/atlas/mainboard.c
@@ -37,8 +37,7 @@
 /* Override dev tree settings per board */
 void variant_devtree_update(void)
 {
-	struct device *root = SA_DEV_ROOT;
-	config_t *cfg = root->chip_info;
+	config_t *cfg = config_of_path(SA_DEVFN_ROOT);
 
 	/* Update PL2 based on CPU */
 	cfg->tdp_pl2_override = get_pl2();