Starting the arch/powerpc merge

[Paul Mackerras]

Kumar Gala writes:

> You have duplicated files between arch/ppc/ and arch/powerpc.  Do you  
> plan on cleaning this up are should we make sure we "fix" both?

I did that deliberately so that I could hack the merged version
without worrying about whether I would break the compile with ARCH=ppc
or ARCH=ppc64.  If it turns out that the merged version of some file
is sufficiently similar to the ppc version, we can then delete the ppc
version and just use the merged version.

Paul.