[PATCH 1/2] dt-bindings: Add Apple SoC GPU

[Alyssa Rosenzweig]

> > +              - apple,agx-g13s
> > +              - apple,agx-g13c
> > +              - apple,agx-g13d
> > +          - const: apple,agx-g13x
> 
> I'm assuming the 'x' is a wildcard. The preferred thing to do make one
> of the 3 actual devices the fallback. Typically, the oldest one is
> used.

Yeah, it's something of a family. G13X is an apple codename for these
three chips.

We can do `apple,agx-g13d, apple,agx-g13s` as the compatible list and
omit the g13x compatible. I'm not sure if that's actually better since
we'd continue to use the G13X naming in the driver itself but it's a
minor point either way.