can: ctucanfd: remove debug statements

This patch removes the debug statements from the driver to make
checkpatch.pl and patchwork happy.

Link: https://lore.kernel.org/all/1fd684bcf5ddb0346aad234072f54e976a5210fb.1650816929.git.pisa@cmp.felk.cvut.cz


Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
[mkl: split into separate patches]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>