We now configure each PCI device as it is enumerated, in pci_device_add(),
so remove the configuration done in shpchp.

That configuration, in pci_configure_device(), does not include the
MPS/MRRS configuration done by pcie_bus_configure_settings(), so keep
that here.
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NYinghai Lu <yinghai@kernel.org>