AGESA: Use pcidev_on_root()

We have constant CONFIG_CBB==0, replace ill dev_find_slot()
with safe pcidev_on_root();

Change-Id: Ieb2030fa3d77a9f49fc5faf12b92b5f00f49d354
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/26482
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/amd/agesa/family14/state_machine.c b/src/northbridge/amd/agesa/family14/state_machine.c
index 89aca7d..8db6095 100644
--- a/src/northbridge/amd/agesa/family14/state_machine.c
+++ b/src/northbridge/amd/agesa/family14/state_machine.c
@@ -40,7 +40,7 @@
 #ifdef __SIMPLE_DEVICE__
 	pci_devfn_t dev = PCI_DEV(0, 0x18, 2);
 #else
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x18, 2));
+	struct device *dev = pcidev_on_root(0x18, 2);
 #endif
 	if (boot_cpu()) {
 		u32 mct_cfg_lo = pci_read_config32(dev, 0x118);