Very insightful as always, thanks.
FYI, the VS12 moniker has cropped up in the names for the dovi.ko, so it exists in some form if just a filename!, what it means though is unknown - from YadaYada :
So left guessing, vs10 and vs12 look like they are internal versioning / designations of some kind probably related to versions of the dolby software development kit used for SoC implementations.
My speculation would be vs10 is cm2.9 era and v12 is cm4.0 era.