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etheri225: add clause 45 phy auto-negotiation

this means 2.5 gigabit links are reported correctly.

--- a/sys/src/9/pc/etheri225.c

+++ b/sys/src/9/pc/etheri225.c

@@ -594,6 +594,7 @@

 	csr32w(c, Rdevctrl, csr32r(c, Rdevctrl) | DClink | DClinkauto);

 	miimiw(phy, Bmcr, miimir(phy, Bmcr) & ~BmcrPd); microdelay(300);

 	miiane(phy, ~0, ~0, ~0);

+	miianec45(phy, ~0);

 }

 static void

@@ -1021,12 +1022,15 @@

 			/* phy missing? */

 			continue;

 		}

-		miistatus(phy);

+

+		if (miistatus(phy) == 0)

+			miistatusc45(phy);

 		if (phy->speed == 0) {

 			/* phy errata: rinse and repeat, should only happen once */

 			miireset(phy);

 			continue;

 		}

+

 		/* report status */

 		ethersetspeed(c->edev, phy->speed);

 		ethersetlink(c->edev, phy->link);

-- 

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