miiphy: convert to linux/mii.h

The include/miiphy.h header duplicates a lot of things from linux/mii.h.
So punt all the things that overlap to keep the API simple and to make
merging between U-Boot and Linux simpler.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/drivers/net/phy/mv88e61xx.c b/drivers/net/phy/mv88e61xx.c
index 2d1de02..483a920 100644
--- a/drivers/net/phy/mv88e61xx.c
+++ b/drivers/net/phy/mv88e61xx.c
@@ -354,7 +354,7 @@
 		printf("Invalid cpu port config, using default port5\n");
 	}
 
-	RD_PHY(name, MV88E61XX_PRT_OFST, PHY_PHYIDR2, &reg);
+	RD_PHY(name, MV88E61XX_PRT_OFST, MII_PHYSID2, &reg);
 	switch (reg &= 0xfff0) {
 	case 0x1610:
 		idstr = "88E6161";