PCI: drop dead pci_lock_*pdev() declarations

They have no definitions, and hence users, anywhere.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>

xen/include/xen/pci.h

@@ -155,9 +155,6 @@ bool_t pci_device_detect(u16 seg, u8 bus, u8 dev, u8 func);
 int scan_pci_devices(void);
 enum pdev_type pdev_type(u16 seg, u8 bus, u8 devfn);
 int find_upstream_bridge(u16 seg, u8 *bus, u8 *devfn, u8 *secbus);
-struct pci_dev *pci_lock_pdev(int seg, int bus, int devfn);
-struct pci_dev *pci_lock_domain_pdev(
-    struct domain *, int seg, int bus, int devfn);
 
 void setup_hwdom_pci_devices(struct domain *,
                             int (*)(u8 devfn, struct pci_dev *));