spi: spi-fsl-lpspi: downgrade log level for pio mode

Having no DMA is not an error. The simplest reason is not having it
configured. SPI will still be usable, so raise a warning instead to
get still some attention.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20230531072850.739021-1-alexander.stein@ew.tq-group.com


Signed-off-by: Mark Brown <broonie@kernel.org>