Read or set the CAN bitrate of CAN Port 3. The value is in Bit per second.
If the bitrate is changed while the CAN controller is running, it will be shut down and the new
bitrate will be set. If this was successful, the CAN controller will be started again with the
new bitrate.
If the new bitrate could not be set, the old bitrate will be set again.
If the CAN controller is off when setting the new bitrate, it will not be started after setting the
bitrate.
Only supported on devices with 3 or more CAN controllers.