spi: spi-mem: Reorder spi-mem macro assignments

Follow the order in which all the `struct spi_mem_op` members are
defined.

This is purely aesthetics, there is no functional change.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://patch.msgid.link/20241224-winbond-6-11-rc1-quad-support-v2-18-ad218dbc406f@bootlin.com


Signed-off-by: Mark Brown <broonie@kernel.org>