Merge branch 'pci/portdrv'

Merge branch 'pci/portdrv'

- Drop device reference unconditionally in pcie_port_remove_service() to
  fix resource leak (Uwe Kleine-König)

- Remove empty pcie_port_shutdown_service() callback (Uwe Kleine-König)

- Remove unnecessary bus_type check in pcie_port_bus_match() (Uwe
  Kleine-König)

- Move pcie_port_bus_match() and pcie_port_bus_type to PCIe-specific
  portdrv.c (Uwe Kleine-König)

- Remove unnecessary dev and dev->driver checks in portdrv .probe() and
  .remove() (Uwe Kleine-König)

- Take advantage of pcie_port_bus_type.probe() and .remove() instead of
  assigning them for each portdrv service driver (Uwe Kleine-König)

* pci/portdrv:
  PCI/portdrv: Use bus-type functions
  PCI/portdrv: Don't check for valid device and driver in bus callbacks
  PCI/portdrv: Move pcie_port_bus_type to pcie source file
  PCI/portdrv: Don't check for the driver's and device's bus
  PCI/portdrv: Drop empty shutdown callback
  PCI/portdrv: Fix potential resource leak