northbridge/amd/amdht: transition away from device_t

Replace the use of the old device_t definition inside
northbridge/amd/amdht.

Change-Id: I7dfb8f001504c691aeddf1bfbc3be05cc7d31ce4
Signed-off-by: Antonello Dettori <dev@dettori.io>
Reviewed-on: https://review.coreboot.org/16468
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/northbridge/amd/amdht/ht_wrapper.c

@@ -69,7 +69,7 @@
 
 static  u32 get_nodes(void)
 {
-	device_t dev;
+	pci_devfn_t dev;
 	u32 nodes;
 
 	dev = PCI_DEV(CONFIG_CBB, CONFIG_CDB, 0);