ARM: zynqmp: Fix SPL_DM_SPI dependencies
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>