configs: mx6sabreauto: Add DM_SPI_FLASH necessary configs

Enable all neceassary configs to support DM_SPI_FLASH on mx6sabreauto.

Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
1 file changed