x86/PCI: Clean up and mark early_root_info_init() as deprecated
x86/PCI: Clean up and mark early_root_info_init() as deprecated

early_root_info_init() is now deprecated in favor of info in ACPI.  Add a
note to that effect.  Also, clean up the code a bit.

There is no functional change.

Signed-off-by: Suravee Suthikulpanit <ed04488ebbbd0c8ebb072b7ab25add9fa816eb84@amd.com>
Signed-off-by: Bjorn Helgaas <f10ec01be0c6b54271af5c550cd257810bdf3268@google.com>
KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs