PCI/PTM: Consolidate PTM interface declarations

Consolidate all the PTM-related declarations in drivers/pci/pci.h.  No
functional change intended.

Link: https://lore.kernel.org/r/20220909202505.314195-9-helgaas@kernel.org


Tested-by: Rajvi Jingar <rajvi.jingar@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>