spi: consolidate setting message->spi

Previously, __spi_sync() and __spi_async() set message->spi to the spi
device independently after calling __spi_validate(). __spi_validate()
also would conditionally set this if it needed to split the message
since it wasn't set yet.

Since both __spi_sync() and __spi_async() call __spi_validate(), we can
consolidate this into only setting message->spi once (unconditionally)
in __spi_validate(). This will also save any future callers of
__spi_validate() from also needing to set message->spi.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://msgid.link/r/20240123214946.2616786-1-dlechner@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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