We can catch whether the SPI controller has declared it can take care of
software timestamping transfers, but didn't. So do it.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/20191227012444.1204-1-olteanv@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>