Patch from: Laurent Pinchart <laurentp@cse-semaphore.com>

This patch adds a flag to the DM9000 platform data which, when set,
configures the device to use an external PHY.
Signed-off-by: NLaurent Pinchart <laurentp@cse-semaphore.com>
Signed-off-by: NBen Dooks <ben-linuy@fluff.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>