[U-Boot] Update and Cut down mach types

[Detlev Zundel]

Hi Reinhard,

[...]

> why don't we just create the #define MACH_xxx lines directly from the
> "http://www.arm.linux.org.uk/developer/machines/download.php". We don't
> need all the *_is_* macros in u-boot anyway. Then we would have just a few 1000
> lines of #define MACH_*

... and we could update whenever we feel like it and decouple from the
linux interval.  This looks like a nice clean backwards compatible
solution.

Cheers
  Detlev

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