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powerpc: Move core kernel logic into arch/powerpc/Kbuild
This is a nice cleanup, arch/powerpc/Makefile is long and messy so
moving this out helps a little.
It also allows us to do:
$ make arch/powerpc
Which can be helpful if you just want to compile test some changes to
arch code and not link everything.
Finally it also gives us a single place to do subdir-cc-flags
assignments which affect the whole of arch/powerpc, which we will do
in a future patch.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>