nb/intel/sandybridge: Use pcidev_on_root()

Change-Id: I959dfd1c10bc1ab85c6392e0090b022934468770
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/31292
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/sandybridge/acpi.c

@@ -71,7 +71,7 @@ static unsigned long acpi_create_igfx_rmrr(const unsigned long current)
 {
 	const u32 base_mask = ~(u32)(MiB - 1);
 
-	struct device *const host = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *const host = pcidev_on_root(0, 0);
 	if (!host)
 		return 0;