ea20: fix undefined PHY_* errors

This patch fixes ea20 after 8ef583a0 where
the u-boot custom PHY_ macros were replaced with those of linux/mii.h MII_
definitions except in the RMII support for davinci_emac. Probably also due to
the merge path of changes in 2010.12.

Signed-off-by: Ben <Gardiner&lt;bengardiner@nanometrics.ca>
CC: Mike Frysinger <vapier@gentoo.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>