spi: axi-spi-engine: Emit trace events for spi transfers

As this spi host controller driver implements the
.transfer_one_message() callback, it has to care about these traces
it-self. With the transfers being compiled it's difficult to determine
where handling of one transfer ends and the next begins, so just
generate the start events in batch before the hardware fifo is fed and
the end events when their completion triggered.

Signed-off-by: Uwe Kleine-König <[email protected]>
Reviewed-by: David Lechner <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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