[RFC] reorganize cputypes for PPC64

[Marvin]

Hi,

attached patch introduces a "processor type" menu similar to ppc32. It 
_should_ not change anything upto now. 

The aim is to allow future fine graded cpu optimizations via mcpu/mtune 
compiler flags and also to clean up the arch Makefile/Kconfig.cputypes (I 
know this is a minefield).

Greetings

Marvin

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