spi: fsi: Print status on error

Print the SPI engine status register when an error is detected. This
will aid tremendously in debugging failed transactions.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20211004195149.29759-1-eajames@linux.ibm.com


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