I think the CD32 had one of the embedded chip
CPU's (eg. 68ECxxxx), but I know Amiga's definately went to the 68040.
Some did use the 68050 and 68060, but I don't know whether they were added later by
users or whether they were added at the factory.
Of course Natima is going to run the 68070, but don't quote me on that as I
haven't been following the project that closely.
There was no such thing as a 68050 :)
And Commodore only ever sold Amiga's with maximum 68040s (on a plugin
board, as a sortoff 'upgrade directly from the factory'), 68060's are
entirely aftermarket, some very late A4000T's where sold with 68060's
but this was on a 3rd party Accelerator board.
Ofcourse, porting Inferno to Amiga would require quite a bit more
effort to also support graphics etc, the Amiga doesnt have character
modes, so you will have to implement a whole framebuffer and run a
console on top of that (linux fb originates from the m68k port for
exactly this reason).
Also, Natami will not use the '68070' (which was a 68000 based SOC),
but their own rather wonky idea of a improved 060.