[ARM] 4746/1: pcm027: network support for phyCORE-PXA270

This patch adds SMC91x support for the phyCORE-PXA270 CPU module (aka PCM-027).

Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>