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>

src/mainboard/google/fizz/mainboard.c

@@ -221,8 +221,7 @@ static unsigned long mainboard_write_acpi_tables(
 
 static void mainboard_enable(struct device *dev)
 {
-	struct device *root = SA_DEV_ROOT;
-	config_t *conf = root->chip_info;
+	config_t *conf = config_of_path(SA_DEVFN_ROOT);
 
 	mainboard_set_power_limits(conf);