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ether82563: work arround for 82579LM on Lenovo X230

dont reset the the phy on reset as this causes the link
to be stuck at 10mbps.

--- a/sys/src/9/pc/ether82563.c

+++ b/sys/src/9/pc/ether82563.c

@@ -1604,6 +1604,12 @@

 	r = csr32r(ctlr, Ctrl);

 	if(ctlr->type == i82566 || ctlr->type == i82579)

 		r |= Phyrst;

+	/*

+	 * hack: 82579LM on lenovo X230 is stuck at 10mbps after

+	 * reseting the phy, but works fine if we dont reset.

+	 */

+	if(ctlr->pcidev->did == 0x1502)

+		r &= ~Phyrst;

 	csr32w(ctlr, Ctrl, Devrst | r);

 	delay(1);

 	for(timeo = 0;; timeo++){