device: Use pcidev_path_on_root()

Change-Id: I2e28b9f4ecaf258bff8a062b5a54cb3d8e2bb9b0
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30400
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/northbridge/intel/gm45/raminit.c

@@ -1165,7 +1165,7 @@ static unsigned int get_mmio_size(void)
 	const struct device *dev;
 	const struct northbridge_intel_gm45_config *cfg = NULL;
 
-	dev = dev_find_slot(0, HOST_BRIDGE);
+	dev = pcidev_path_on_root(HOST_BRIDGE);
 	if (dev)
 		cfg = dev->chip_info;