Removal of "payload" command on ia64

[Vladimir 'φ-coder/phcoder' Serbinenko]

Hello, all. When I was looking at the ambiguous strings and 
mistranslations I came accross "payload" ia64 command in Linux loader. 
Its description was so vague that it could do anything and still match 
the description. So I've decided to investigate to find out what it's 
about. But boot parameter structure in Linux files stops at initrd 
fields. Moreover the only reference on Google to ia64_boot_payload is 
our code. Could someone supply more details? If not I'll assume that it 
was just some debug feature during developpement and isn't used by 
anyone and remove it.

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Regards
Vladimir 'φ-coder/phcoder' Serbinenko