northbridge/amd/agesa: DEVICE_NOOP some stub functions

Use 'DEVICE_NOOP' over stub functions to reduce loc and
improve formalism.

Change-Id: I9c8d608539647cce22fb1dfbe284a6043d3d23d9
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7534
Tested-by: build bot (Jenkins)
Reviewed-by: Bruce Griffith <Bruce.Griffith@se-eng.com>
diff --git a/src/northbridge/amd/agesa/family16kb/northbridge.c b/src/northbridge/amd/agesa/family16kb/northbridge.c
index d47a00d..74a72f4 100644
--- a/src/northbridge/amd/agesa/family16kb/northbridge.c
+++ b/src/northbridge/amd/agesa/family16kb/northbridge.c
@@ -444,9 +444,6 @@
 	}
 }
 
-static void northbridge_init(struct device *dev)
-{
-}
 #if 0				/* TODO: Check if needed. */
 static unsigned scan_chains(device_t dev, unsigned max)
 {
@@ -475,7 +472,7 @@
 	.read_resources	  = read_resources,
 	.set_resources	  = set_resources,
 	.enable_resources = pci_dev_enable_resources,
-	.init		  = northbridge_init,
+	.init		  = DEVICE_NOOP,
 	//.scan_bus	  = scan_chains, /* TODO: */
 	.enable		  = 0,
 	.ops_pci	  = 0,