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/nami/mainboard.c b/src/mainboard/google/poppy/variants/nami/mainboard.c
index adb8c00..1ec9e3a 100644
--- a/src/mainboard/google/poppy/variants/nami/mainboard.c
+++ b/src/mainboard/google/poppy/variants/nami/mainboard.c
@@ -234,11 +234,11 @@
 	uint32_t sku_id = variant_board_sku();
 	uint32_t i;
 	int oem_index;
-	struct device *root = SA_DEV_ROOT;
-	config_t *cfg = root->chip_info;
 	uint8_t pl2_id = PL2_ID_DEFAULT;
 	struct device *spi_fpmcu = PCH_DEV_GSPI1;
 
+	config_t *cfg = config_of_path(SA_DEVFN_ROOT);
+
 	switch (sku_id) {
 	case SKU_0_SONA:
 	case SKU_1_SONA: