PCI: Apply _HPX Link Control settings to all devices with a link

Previously we applied _HPX type 2 record Link Control register settings
only to bridges with a subordinate bus.  But it's better to apply them to
all devices with a link because if the subordinate bus has not been
allocated yet, we won't apply settings to the device.

Use pcie_cap_has_lnkctl() to determine whether the device has a Link
Control register instead of looking at dev->subordinate.

[bhelgaas: changelog]
Fixes: 6cd33649fa83 ("PCI: Add pci_configure_device() during enumeration")
Signed-off-by: Yinghai Lu <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 0601890..4a3902d 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -6,6 +6,8 @@
 
 extern const unsigned char pcie_link_speed[];
 
+bool pcie_cap_has_lnkctl(const struct pci_dev *dev);
+
 /* Functions internal to the PCI core code */
 
 int pci_create_sysfs_dev_files(struct pci_dev *pdev);