kdb: add rdmsr and wrmsr commands for i386

[Bernardo Innocenti]

Mitch Bradley wrote:

> If it wouldn't be too difficult, it would also be nice to permit 
> embedded commas or dots in the number, because counting digits in a 
> 64-bit number is very difficult without the help of punctuation.

It is customary to use _ for this purpose: 0x01234567_89ABCDEF.

Some people even break it in 16bit words, but it seems overkill
to me.

-- 
   // Bernardo Innocenti
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