spi: spi-mem: Check the controller extra capabilities

Controllers can now provide a spi-mem capabilities structure. Let's make
use of it in spi_mem_controller_default_supports_op(). As we want to
check for DTR operations as well as normal operations in a single
helper, let's pull the necessary checks from spi_mem_dtr_supports_op()
for now.

However, because no controller provide these extra capabilities, this
change has no effect so far.

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]>
Link: https://lore.kernel.org/linux-mtd/[email protected]

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