Commits on Apr 23, 2024

1. Add the ability to update the RoT boot loader (stage0) …

   SpComponent::Stage0 (boot loader) is distinct from SpComponent::ROT (Hubris).
   
   There is no support for an atomic switch-over to stage0 bank 1 (stage0next).
   Copy from stage0next to stage0 is allowed if stage0next signatuire is valid at boot
   time and contents still match boot-time contents.
   
   Note: Only one stage0 update should be in process in a rack at a time to reduce the
   chance of an interrupted copy bricking a subsystem.
   
   RotStateV3 includes the FWID of all RoT image flash banks and error
   information if an image is not valid. The FWID for invalid banks is
   always computed and reported. This allows us to distinguish between
   completly erased banks and those that are not completely erased:
   
   The FWID over any erased bank is the "a7ff..." value below:
   ```
   $ touch empty.bin
   $ rot-fwid empty.bin
   empty.bin 0 a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a
   ```
   
   Add a versioned RoT Boot Info message to facilitate update of RoT Hubris independant
   of SP or RoT being on a later version than the other.
   
   SpStateV3 does not contain RotState because coupling them and allowing for version skew
   over-complicates things.
   
   Implement Display for RotState* for nicer human output.
   
   Bumped the faux-mgs crate version
   
   Add test for SpStateV3

   

   lzrd committed Apr 23, 2024
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