This is to

  - handle _CRS with multiple vendor-specific resources
  - use acpi_walk_resources() instead of doing it by hand
  - make lookup of vendor resource by GUID generic
  - cleanup now-unused helper functions

(This depends on the previous IO port space patches, because
they removed the last of acpi_get_addr_space()).

My hope is that acpi_vendor_resource_match() and
acpi_find_vendor_resource() can someday move into ACPI,
but that probably depends on getting the idea of labelling
vendor resources with a GUID into the spec.  HP does this
and I think is working on putting it in the spec.