ACPI / PCI / PCIe: Rework _OSC handling

Hi,

The following patchset is based on
https://patchwork.kernel.org/patch/114917/ and the comments I received on that patch. Hopefully, I took all of the comments into account.

[1/7] - Remove the last argument of acpi_pci_osc_run(); this is a cleanup, but
IMO it makes sense.

[2/7] - Introduce acpi_pci_root_osc_query() allowing the caller to get a
mask of _OSC control bits the BIOS allows the kernel to control for a given PCI root bridge.

[3/7] - Rework the PCIe port driver to request _OSC control for all serives at
once.

[4/7] - Disable PCIe port services (that might be enabled by the BIOS) during
initialization.

[5/7] - Remove the PCIe port driver modules exit function.

[6/7] - Rework acpi_pci_osc_control_set() so that it doesn't use cached
result of a query and remove the fields of struct acpi_pci_root that
aren't used any more.

[7/7] - Reorder checks in acpi_pci_osc_control_set()

Comments (and testing :-)) welcome.

Thanks,
Rafael