[coreboot] #161: Improve USB debug port configuration

[coreboot]

#161: Improve USB debug port configuration
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    Reporter:  oxygene      |         Owner:  stepan@…             
        Type:  enhancement  |        Status:  new                  
    Priority:  trivial      |     Milestone:                       
   Component:  coreboot     |      Keywords:                       
Dependencies:               |   Patchstatus:  there is no patch    
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 Right now, the right port number is configured in DBGP_DEFAULT without
 much documentation anywhere. It's even defined in boards that don't use
 the value at all.

 Maybe move it to Kconfig? Document it? Just clean up the copy&pasted
 useless values?

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Ticket URL: <https://tracker.coreboot.org/trac/coreboot/ticket/161>
coreboot <http://www.coreboot.org/>