PCI: Add wrappers for dev_printk()

Add PCI-specific dev_printk() wrappers and use them to simplify the code
slightly.  No functional change intended.

Signed-off-by: Frederick Lawler <fred@fredlawl.com>
[bhelgaas: squash into one patch]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 4708eb9..189e6cc 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -542,7 +542,7 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 	}
 
 	if (!error)
-		dev_dbg(&dev->dev, "power state changed by ACPI to %s\n",
+		pci_dbg(dev, "power state changed by ACPI to %s\n",
 			 acpi_power_state_string(state_conv[state]));
 
 	return error;