PCI: Remove pci_block_cfg_access() et al (unused)

Remove the following unused functions from include/linux/pci.h:

  pci_block_cfg_access()
  pci_block_cfg_access_in_atomic()
  pci_unblock_cfg_access()

These were added by fb51ccbf21 ("PCI: Rework config space blocking
services"), though no callers were added.

Link: https://lore.kernel.org/r/20190715203416.37547-1-skunberg.kelsey@gmail.com
Signed-off-by: Kelsey Skunberg <skunberg.kelsey@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>

include/linux/pci.h

@@ -1747,11 +1747,6 @@ static inline void pci_release_regions(struct pci_dev *dev) { }
 
 static inline unsigned long pci_address_to_pio(phys_addr_t addr) { return -1; }
 
-static inline void pci_block_cfg_access(struct pci_dev *dev) { }
-static inline int pci_block_cfg_access_in_atomic(struct pci_dev *dev)
-{ return 0; }
-static inline void pci_unblock_cfg_access(struct pci_dev *dev) { }
-
 static inline struct pci_bus *pci_find_next_bus(const struct pci_bus *from)
 { return NULL; }
 static inline struct pci_dev *pci_get_slot(struct pci_bus *bus,