powerpc: Remove arch/ppc and include/asm-ppc

All the maintained platforms are now in arch/powerpc, so the old
arch/ppc stuff can now go away.

Acked-by: Adrian Bunk <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Acked-by: Becky Bruce <[email protected]>
Acked-by: Benjamin Herrenschmidt <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]>
Acked-by: Grant Likely <[email protected]>
Acked-by: Jochen Friedrich <[email protected]>
Acked-by: John Linn <[email protected]>
Acked-by: Jon Loeliger <[email protected]>
Acked-by: Josh Boyer <[email protected]>
Acked-by: Kumar Gala <[email protected]>
Acked-by: Olof Johansson <[email protected]>
Acked-by: Peter Korsgaard <[email protected]>
Acked-by: Scott Wood <[email protected]>
Acked-by: Sean MacLennan <[email protected]>
Acked-by: Segher Boessenkool <[email protected]>
Acked-by: Stefan Roese <[email protected]>
Acked-by: Stephen Neuendorffer <[email protected]>
Acked-by: Wolfgang Denk <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>

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