Looking for example for atsamc21 CAN FD

[silverv]

@benys Do you have an example to share? I didn't find one in the pull request: #50408

[benys]

@silverv my PR has only CAN driver for C21 and extension for SAMC21N board.
I don't have expirence with CANFD - I used only CAN.
To confirm my solution I check samples from samples/drivers/can and with in my project.