This adds support for specifying the address space used by a bridge child;
this will either be the bridged SoC address space, or the host address space
required by children that map non SoC-address ranges from the PCI BAR.
This is necessary to support SROM/OTP child devices that live directly
beneath the bhndb device and require access to host resources, instead
of the standard behavior of delegating access to the bridged SoC address
space.
Submitted by: Landon Fuller <landonf@landonf.org>
Differential Revision: https://reviews.freebsd.org/D5757
e9378f456a