PCI/ACPI: Move _OSC stuff from acpi_pci_root_add() to negotiate_os_control()
PCI/ACPI: Move _OSC stuff from acpi_pci_root_add() to negotiate_os_control()

This doesn't change any of the _OSC code; it just moves it out into
a new function so it doesn't clutter acpi_pci_root_add() so much.  This
also enables future simplifications.

Signed-off-by: Bjorn Helgaas <f10ec01be0c6b54271af5c550cd257810bdf3268@google.com>
Acked-by: Rafael J. Wysocki <27ffc44a8ec6a212fba98cfc3246c6ce8ab131e0@intel.com>
KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs