[PATCH] Fix CPUID documentation and return values

[Vladimir 'phcoder' Serbinenko]

Hello. CPUID command currently doesn't return a real grub_err_t and
errors aren't set which doesn't fit in grub2's design.
Addirionally "help cpuid" doesn't give really useful info. So for
future expandability and less confusion I propose the attached patch
partially based on original patch by Robert Millan

-- 
Regards
Vladimir 'phcoder' Serbinenko

Personal git repository: http://repo.or.cz/w/grub2/phcoder.git

cpuid.diff
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