[Skiboot] [PATCH 2/2] centaur: Add indirect XSCOM support

[Stewart Smith]

Benjamin Herrenschmidt <benh at kernel.crashing.org> writes:
> It works just like P8, we copy the code for now rather than make
> it somewhat common due to our locking differences and to limit
> the risk close to release. We can refactor later.

Merged, thanks!

In related news, I should train people using internal Bugzilla to add
Tested-by to such commits to better track testing.