Additional CM sensors for CM type, revision and serial number

[alpakpinar]

Is your feature request related to a problem? Please describe.
It is not related to a specific problem. But it would be really handy if there would be sensors from the Command Module (CM) describing the type, revision and serial number, which can be read out by the OpenIPMC. This would also make it possible to read out those values even if the Zynq is not booting.

Describe the solution you'd like
Ideally, since OpenIPMC supports numerical sensors, one CM sensor for each piece of information could be used:

CM Type: Maybe this can be represented as an enum. For example, 0 -> Cornell CM, 1 -> MPI CM
CM Revision: The CM revision number can be provided by this sensor.
CM Serial: The CM serial number can be provided by this sensor.

With these CM sensors, the goal would be to see three additional sensors in the output of the ipmitool sensor command.

Describe alternatives you've considered
One variation can be in the number of CM sensors to be added. It could be nice if there is a single CM sensor that represents all type, revision and serial information, but it is not clear how that can be easily encoded/decoded on the OpenIPMC side and displayed to the user.

Another alternative is to write these values to Zynq registers (which I believe most of it is already there), the downside would be then we won't be able to read these values if Zynq didn't boot.

Additional context
This is a rather low priority request, thanks for considering it and let us know if you have suggestions about this! I'll include @dgastler here as the original requester of the feature.