sungem: Fix Serdes detection.

We need to look for the 'shared-pins' property to get
this right.

Based upon a patch by Hermann Lauer.
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sungem.c

@@ -2062,7 +2062,15 @@ static int gem_check_invariants(struct gem *gp)
 		mif_cfg &= ~MIF_CFG_PSELECT;
 		writel(mif_cfg, gp->regs + MIF_CFG);
 	} else {
-		gp->phy_type = phy_serialink;
+#ifdef CONFIG_SPARC
+		const char *p;
+
+		p = of_get_property(gp->of_node, "shared-pins", NULL);
+		if (p && !strcmp(p, "serdes"))
+			gp->phy_type = phy_serdes;
+		else
+#endif
+			gp->phy_type = phy_serialink;
 	}
 	if (gp->phy_type == phy_mii_mdio1 ||
 	    gp->phy_type == phy_mii_mdio0) {