During debugging it turned out that some people have setups where the SPI
communication is more prone to CRC errors.

Increase the severity of both the transfer retry and transfer failure message
to give users feedback without the need to recompile the driver with debug
enabled.

Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Thomas Kopp <thomas.kopp@microchip.com>
Link: http://lore.kernel.org/r/20201019190524.1285319-15-mkl@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>