CS89x0: Add networking support for QQ2440

QQ2440 is only another non-ISA board using CS89x0. This patch adds the
minimum bits required to make QQ2440 work with CS89x0.

Signed-off-by: Domenico Andreoli <cavokz@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>