adjust watchpoint testing

[Nathan Sidwell]

Wu Zhou wrote:

> Do you mean to hard-wire the number of the hw watchpoint the underlying target
> support into these base board files, or just set the number to 1?

the base board file knows the characteristics of the board, so is the 
appropriate place to set this value.

> 
> I guess that we might need to work out a way to detect the number 
> automatically. Any thought?

yes, that's what I was talking about with qPacketInfo

nathan
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