In order to implement the patch discussed in https://gitlab.winehq.org/wine/wine/-/merge_requests/5491#note_67907
-- v2: win32u: Return STATUS_ALREADY_COMPLETE from UpdateDisplayDevices. win32u: Pass gdi_gpu structure members as add_gpu parameters. win32u: Remove driver-specific id from struct gdi_gpu. win32u: Use struct pci_id in struct gdi_gpu. win32u: Remove now unnecessary reset_display_manager_ctx.