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re: introduce device_is_attached()

> I want to introduce a new function to sys/devices.h:
> bool device_is_attached(device_t parent, cfdata_t cf);

this doesn't seem to match what the function actually does, which
is answer the question "does this parent bus have a child attached
with the same driver name as in cf->cf_name".

that doesn't handle the more interesting cases i can think of such
as "does this pci bus have something at device 4 function 1", which
is a question i'd expect "device_is_attached{,_p}()" to answer.  ie,
it is limited to fake busses AFAICT.

i don't think we should adopt this function in sys/device.h.


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