PCI: Use acpi_pci_power_manageable()

Use acpi_pci_power_manageable() instead of duplicating the logic in
acpi_pci_bridge_d3().  No functional change intended.

[bhelgaas: split out from
https://lore.kernel.org/r/20210817180500.1253-8-ameynarkhede03@gmail.com]
Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/pci-acpi.c

@@ -941,6 +941,15 @@ void pci_set_acpi_fwnode(struct pci_dev *dev)
 				   acpi_pci_find_companion(&dev->dev));
 }
 
+static bool acpi_pci_power_manageable(struct pci_dev *dev)
+{
+	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
+
+	if (!adev)
+		return false;
+	return acpi_device_power_manageable(adev);
+}
+
 static bool acpi_pci_bridge_d3(struct pci_dev *dev)
 {
 	const struct fwnode_handle *fwnode;
@@ -953,9 +962,8 @@ static bool acpi_pci_bridge_d3(struct pci_dev *dev)
 
 	/* Assume D3 support if the bridge is power-manageable by ACPI. */
 	pci_set_acpi_fwnode(dev);
-	adev = ACPI_COMPANION(&dev->dev);
 
-	if (adev && acpi_device_power_manageable(adev))
+	if (acpi_pci_power_manageable(dev))
 		return true;
 
 	/*
@@ -986,12 +994,6 @@ static bool acpi_pci_bridge_d3(struct pci_dev *dev)
 	return val == 1;
 }
 
-static bool acpi_pci_power_manageable(struct pci_dev *dev)
-{
-	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
-	return adev ? acpi_device_power_manageable(adev) : false;
-}
-
 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 {
 	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);