Correct the irq for spacecast phy.

The current mdiobus_register does not seem to make use of irq array.
That is probably the reason this error is not affecting anything. To be
consistent with the change on phy_id, this field is also updated in case
modiobus_register will use it later.

Change-Id: I49b4363eececc54e173a753207d7db0355c817cc
diff --git a/arch/arm/mach-comcerto/board-optimus.c b/arch/arm/mach-comcerto/board-optimus.c
index ead1a9b..c263f905 100644
--- a/arch/arm/mach-comcerto/board-optimus.c
+++ b/arch/arm/mach-comcerto/board-optimus.c
@@ -652,13 +652,16 @@
 		/* Do not waste time probing other PHYs.              */
 #ifdef CONFIG_GOOGLE_SPACECAST
 		.phy_mask = 0xFFFFFFFD,
+		.irq = {
+			[1] = PHY_POLL,
+		},
 #else
 		.phy_mask = 0xFFFFFFEF,
-#endif
-		.mdc_div = 96,
 		.irq = {
 			[4] = PHY_POLL,
 		},
+#endif
+		.mdc_div = 96,
 	},
 };