PCI/portdrv: Unexport pcie_port_service_register(), pcie_port_service_unregister()

pcie_port_service_register() and pcie_port_service_unregister() are used
only by the pciehp, aer, dpc, and pme PCIe port service drivers, none of
which can be modules.  Unexport pcie_port_service_register() and
pcie_port_service_unregister().  No functional change intended.

Link: https://lore.kernel.org/r/20221019204127.44463-4-helgaas@kernel.orgSigned-off-by: NBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NKeith Busch <kbusch@kernel.org>

drivers/pci/pcie/portdrv.c

@@ -584,7 +584,6 @@ int pcie_port_service_register(struct pcie_port_service_driver *new)
 
 	return driver_register(&new->driver);
 }
-EXPORT_SYMBOL(pcie_port_service_register);
 
 /**
  * pcie_port_service_unregister - unregister PCI Express port service driver
@@ -594,7 +593,6 @@ void pcie_port_service_unregister(struct pcie_port_service_driver *drv)
 {
 	driver_unregister(&drv->driver);
 }
-EXPORT_SYMBOL(pcie_port_service_unregister);
 
 /* If this switch is set, PCIe port native services should not be enabled. */
 bool pcie_ports_disabled;