can: flexcan: fix typos

This patch fixes two typos found by codespell.

Fixes: 812f0116 ("can: flexcan: add CAN wakeup function for i.MX8QM")
Link: https://lore.kernel.org/r/20210127085529.2768537-2-mkl@pengutronix.de


Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>