spi: cadence-quadspi: Provide a capability structure

This controller has DTR support, so advertize it with a capability now
that the spi-controller structure contains this new field. This will
later be used by the core to discriminate whether an operation is
supported or not, in a more generic way than having different helpers.

Signed-off-by: Miquel Raynal <[email protected]>
Reviewed-by: Pratyush Yadav <[email protected]>
Reviewed-by: Boris Brezillon <[email protected]>
Reviewed-by: Tudor Ambarus <[email protected]>
Reviewed-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/linux-mtd/[email protected]

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