[Skiboot] [RFC PATCH] Remove POWER9 DD1 support

[Michael Neuling]

Nick,

This seems to be missing your SOB

On Tue, 2019-01-08 at 00:09 +1000, Nicholas Piggin wrote:
> There's a couple of cases I'm not sure if they're still needed (marked
> with XXX).
> 
> Hostboot and Linux have removed DD1 support so there's not much point
> keeping it around.

Ack on the concept. It should be POWER9N DD1.  POWER9C DD1 is still alive.

It looks like the XIVE code will assert if it sees DD1 but might be worth
calling that out in the commit message and adding a more explicit assert in
core/cpu.c 

Mikey