[todo] update firmware locations & paths

in general the firmware-name should something like

`qcom/sdm845/mba.mbn` -> `qcom/sdm845/Comma/tizi/mba.mbn`
vendor can be `Comma`, `Comma.AI`, `comma`, whatever you decide for the project
codename can be `tizi` or `mici`, depends what came first or what is the preferred codename (can be shared by both models of course).

No need to do this changes ASAP, but for the proper mainlining it's needed, so going in that direction smooth the transition.

No file, test, or entry point is named. Start by locating the current firmware-name and path definitions, then inspect how firmware paths are consumed for the comma 3X and comma four. Confirm the vendor and codename convention, and consider the work done when both models use the agreed paths consistently.

Written by the indexing model from the issue text.