xilinx: Enable SPI_FLASH_MTD by default

Provide access to qspi flash layout via mtd command.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/b3c4a3eddb71aab9535b034380d0dbae770828d4.1698837725.git.michal.simek@amd.com
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