configs: igep00x0: Enable DM_SPI

Enable DM_SPI for igep00x0 board.

Build is fine, but not tested.

Cc: Enric Balletbo i Serra <eballetbo@gmail.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>