siemens: rastaban: Enable DM_SPI, DM_SPI_FLASH

Enable DM_SPI, DM_SPI_FLASH for siemens rastaban board.

Build is fine, but not tested.

Cc: Samuel Egli <samuel.egli@siemens.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
1 file changed