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CPU selection Kconfig cleanup, take 4

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Cover letter [patch 0/9] CPU selection Kconfig cleanup, take 4

This time, I've removed all the changes that allow you to build multiplatform kernels for the 8xxx embedded CPUs since Kumar was not sure about those. Patch 9/9 still contains the patches, but you can easily leave that one out.

What's left in patches 1-8 is basically

1. The selection of -mcpu and -mtune flags for all CPUs, which should provide better optimized code in many cases, as well as avoiding bugs that happen when the tool chain is built to default to a different CPU.

2. All fixes for the bugs that I found in the process of making multiplatform builds work for 6xx and e500.

        Arnd <><