PCI: Drop of_match_ptr() to avoid unused variables

We have stubs for most OF interfaces even when CONFIG_OF is not set, so we
allow building of most controller drivers in that case for compile testing.

When CONFIG_OF is not set, "of_match_ptr(<match_table>)" compiles to NULL,
which leaves <match_table> unused, resulting in errors like this:

  $ make W=1
  drivers/pci/controller/pci-xgene.c:636:34: error: ‘xgene_pcie_match_table’ defined but not used [-Werror=unused-const-variable=]

Drop of_match_ptr() to avoid the unused variable warning.

See also 1dff012f636d ("PCI: Drop of_match_ptr() to avoid unused
variables").

Link: https://lore.kernel.org/r/20221025191339.667614-2-helgaas@kernel.org
Link: https://lore.kernel.org/r/20221116205100.1136224-2-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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