Remove driver code to handle sequence numbers

The driver is assigning sequence numbers to mockturtle messages in both directions. This comes from the old times when a HMQ was not assigned to a single CPU, but they were arbitrarily used by multiple CPU. So the driver was doing it to avoid implementing a synchronization mechanism among firmwares.

Now a HMQ are reserved to CPU, so the firmware in it can safely assign sequence numbers. The host code can do the same knowing that a there are different sequences for different CPUs