biostar/am1ml: transition away from device_t

Replace the use of the old device_t definition inside
mainboard/biostar/am1ml.

Change-Id: Iba2fff5617c62152355b54e446517ad36108aa31
Signed-off-by: Antonello Dettori <dev@dettori.io>
Reviewed-on: https://review.coreboot.org/16688
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/mainboard/biostar/am1ml/romstage.c b/src/mainboard/biostar/am1ml/romstage.c
index 12d9eee..d7da2bb 100644
--- a/src/mainboard/biostar/am1ml/romstage.c
+++ b/src/mainboard/biostar/am1ml/romstage.c
@@ -110,7 +110,7 @@
 {
 	u32 val, t32;
 	u8 byte;
-	device_t dev;
+	pci_devfn_t dev;
 	u32 *addr32;
 
 	/* In Hudson RRG, PMIOxD2[5:4] is "Drive strength control for