spi: atmel: Exposing effective spi speed

This patch implements the reporting of the effectively used speed_hz for
the transfer by setting xfer->effective_speed_hz.

See the following patch, which adds this feature to the SPI core for more
information:
commit 5d7e2b5ed585 ("spi: core: allow reporting the effectivly used speed_hz for a transfer")

Signed-off-by: Thomas Kopp <[email protected]>
Reviewed-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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