drivers: can: remove CAN_FILTER_FDF flag

Remove the CAN_FILTER_FDF flag for filtering on classic CAN/CAN FD frames
as it is not supported natively by any known CAN controller.

Applications can still filter on classic CAN/CAN FD frames in their receive
callback functions as needed.

Fixes: #64554

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>