Add missing dependencies for DM_SPI_FLASH. Kconfig reports it as: WARNING: unmet direct dependencies detected for SPL_DM_SPI_FLASH Depends on [n]: SPL [=n] && SPL_DM [=n] Selected by [y]: - ARCH_ZYNQMP [=y] && <choice> && SPL_DM_SPI [=y] Signed-off-by: Michal Simek <michal.simek@xilinx.com>