Merge branch 'sja1105-spi'

Vladimir Oltean says:

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Adapt the sja1105 DSA driver to the SPI controller's transfer limits

This series changes the SPI transfer procedure in sja1105 to take into
consideration the buffer size limitations that the SPI controller driver
might have.

Changes in v2:
Remove the driver's use of cs_change and send multiple, smaller SPI
messages instead of a single large one.
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Signed-off-by: David S. Miller <davem@davemloft.net>