device: Use pcidev_on_root()

Change-Id: Icf34b39d80f6e46d32a39b68f38fb2752c0bcebc
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/26484
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Piotr Król <piotr.krol@3mdeb.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/soc/intel/baytrail/pmutil.c

@@ -43,7 +43,7 @@ static struct device *pcu_dev;
 static struct device *get_pcu_dev(void)
 {
 	if (pcu_dev == NULL)
-		pcu_dev = dev_find_slot(0, PCI_DEVFN(PCU_DEV, 0));
+		pcu_dev = pcidev_on_root(PCU_DEV, 0);
 	return pcu_dev;
 }
 #endif