Integrate bhnd_chipc's BUS_ADD_CHILD() with a child resource mapping table.

[landon_landonf.org]

Summary

This adds support for automatically configuring bhnd_chipc bus children
with associated resources, using an internal 'hints' table based directly
on Michael Zhilin's chipc resource mapping work.

The bhnd_sprom_chipc driver has been converted to use DEVICE_IDENTIFY()
with the new resource table.

This should be nearly drop-in compatible with the child device drivers
in D6250.

Depends on D6515