Add MIPS dependency for dm9000 ethernet controller.  Indeed this controller
is used by some embedded platforms based on MIPS CPUs.
Signed-off-by: NFranck Bui-Huu <franck.bui@gmail.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>