devicetree: Change scan_bus() prototype in device ops

The input/output value max is no longer used for tracking the
bus enumeration sequence, everything is handled in the context
of devicetree bus objects.

Change-Id: I545088bd8eaf205b1436d8c52d3bc7faf4cfb0f9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/8541
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/northbridge/amd/agesa/family14/northbridge.c b/src/northbridge/amd/agesa/family14/northbridge.c
index 426ec74..32b74f6 100644
--- a/src/northbridge/amd/agesa/family14/northbridge.c
+++ b/src/northbridge/amd/agesa/family14/northbridge.c
@@ -765,7 +765,7 @@
 
 /* Bus related code */
 
-static u32 cpu_bus_scan(struct device *dev, u32 passthru)
+static void cpu_bus_scan(struct device *dev)
 {
 	struct bus *cpu_bus = dev->link_list;
 	device_t cpu;
@@ -784,7 +784,6 @@
 		if (cpu)
 			amd_cpu_topology(cpu, 0, apic_id);
 	}
-	return passthru;
 }
 
 static void cpu_bus_init(device_t dev)