spi: spi-mem: Kill the spi_mem_dtr_supports_op() helper

Now that spi_mem_default_supports_op() has access to the static
controller capabilities (relating to memory operations), and now that
these capabilities have been filled by the relevant controllers, there
is no need for a specific helper checking only DTR operations, so let's
just kill spi_mem_dtr_supports_op() and simply use
spi_mem_default_supports_op() instead.

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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