iio: adc: ad9467: use DMA safe buffer for spi

Make sure we use a DMA safe buffer (IIO_DMA_MINALIGN) for all the spi
transfers. Only relevant for writes since for reads
spi_write_then_read() is used which does not require DMA safe buffers.

Also note that for consistency, ad9467_spi_read() is also taking struct
ad9467_state as a parameter (even if not really needed).

Fixes: ad6797120238 ("iio: adc: ad9467: add support AD9467 ADC")
Signed-off-by: Nuno Sa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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