spi: imx: add a device specific prepare_message callback
This is just preparatory work which allows to move some initialisation that currently is done in the per transfer hook .config to an earlier point in time in the next few patches. There is no change in behaviour introduced by this patch. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Mark Brown <broonie@kernel.org>
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