rt_paparazzi support for Lia_MX

Basically adds ChibiOS config files for Lia/Lisa F4 (or MX if you prefer).

Somehow these changes are merged with other bullshit from previous commits, unfortunately I don't know about a better solution than just accepting it all in one fat commit (so my repo and paparazzi repo will be identical) - any help with that (rebase/etc)? I just need to overwrite my own rt repo with paparazzi rt repo...

So only the commit  985dd24 is the important one, the rest is just to catch up with the repo.