spi: spi-uclass: Block dm_scan_fdt_dev with OF_CONTROL to prevent build failures

There are devices which don't use OF_CONTROL or OF_PLATDATA but instead
rely on statically defined platdata. Block dm_scan_fdt_dev() with both
configs to avoid build failures under this condition.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>