add support for smc91x ethernet interface on zylonite

add support for smc91x ethernet interface on zylonite

This patch adds LAN91C111 ethernet interface support for zylonite
(a.k.a Marvell's PXA3xx Development Platform) with smc91x driver.

It would be better if a patch would support zylonite along with all
other PXA boards with a single binary of smc91x driver, but it looks
quite difficult for the moment, so ugly #ifdef is still used here.

Signed-off-by: Aleksey Makarov <amakarov@ru.mvista.com>
Acked-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>