of/sparc: fix build regression from of_device changes

Commit id 1636f8ac2b08410df4766449f7c86b912443cd99 (sparc/of: Move
of_device fields into struct pdev_archdata) missed fixing up the
n2_core.c and greth.c drivers.  This patch makes the required changes.

Reported-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/net/greth.c b/drivers/net/greth.c
index 9ec4b7f..f15c64f 100644
--- a/drivers/net/greth.c
+++ b/drivers/net/greth.c
@@ -1412,7 +1412,7 @@
 	}
 
 	regs = (struct greth_regs *) greth->regs;
-	greth->irq = ofdev->irqs[0];
+	greth->irq = ofdev->archdata.irqs[0];
 
 	dev_set_drvdata(greth->dev, dev);
 	SET_NETDEV_DEV(dev, greth->dev);