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 fb51ccbf ("PCI: Rework config space blocking
services"), though no callers were added.

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