[PATCH] Add CONFIG_POWERPC

[Paul Mackerras]

Michael Ellerman writes:

> We don't seem to have a top-level config symbol like other archs do. We have
> PPC64 and PPC, but I think it'd be cleaner to have just one for cases where
> we really mean PPC64 and/or PPC.

CONFIG_PPC already means either 32-bit or 64-bit PowerPC (always has
done, even before the merge).

Paul.