- Return an errno value upon failure, instead of 1.
- Provide a bus_translate_resource() wrapper.
- Implement the generic version, which traverses the hierarchy until a
  bus driver with a non-trivial implementation is found, in subr_bus.c
  like other similar default implementations.
- Make ofw_pcib_translate_resource() return an error if a matching PCI
  address range is not found.
- Make generic_pcie_translate_resource_common() return an int instead of
  a bool.  Fix up callers.

No functional change intended.

Reviewed by:	imp, jhb
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32855