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>
diff --git a/src/southbridge/intel/i82801ix/thermal.c b/src/southbridge/intel/i82801ix/thermal.c
index 5f40d2e..9311982 100644
--- a/src/southbridge/intel/i82801ix/thermal.c
+++ b/src/southbridge/intel/i82801ix/thermal.c
@@ -24,7 +24,7 @@
 
 static void thermal_init(struct device *dev)
 {
-	if (LPC_IS_MOBILE(dev_find_slot(0, PCI_DEVFN(0x1f, 0))))
+	if (LPC_IS_MOBILE(pcidev_on_root(0x1f, 0)))
 		return;
 
 	u8 reg8;