Do we want to be able to read software power enable bits?

[Aaron-Hartwig]

I recently cleaned up how the embedded system reports how port power enable is reported to be the state of the actual hardware enable pin (see oxidecomputer/quartz#282 and oxidecomputer/hubris#2009). That hardware enable pin has two conditions that must be true for it to drive high: a module must be present and the software power enable control bit must be set. Right now we do not have visibility into the status of that bit in the existing message types.

If we were to want this it would be a trivial add to the ExtendedStatus type.