spi: spi-mem: Introduce a capability structure

Create a spi_controller_mem_caps structure and put it within the
spi_controller structure close to the spi_controller_mem_ops
strucure. So far the only field in this structure is the support for dtr
operations, but soon we will add another parameter.

Also create a helper to parse the capabilities and check if the
requested capability has been set or not.

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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