PCI: document pci_target_state

The empty kdoc was causing warnings, so provide some actual documentation.

Signed-off-by: Jesse Barnes <[e-mail]>

drivers/pci/pci.c

···
 }
 
 /**
+ * pci_target_state - find an appropriate low power state for a given PCI dev
+ * @dev: PCI device
+ *
+ * Use underlying platform code to find a supported low power state for @dev.
+ * If the platform can't manage @dev, return the deepest state from which it
+ * can generate wake events, based on any available PME info.
  */
 pci_power_t pci_target_state(struct pci_dev *dev)
 {