PCI/AER: Drop unused pci_disable_pcie_error_reporting()

pci_disable_pcie_error_reporting() has no callers.  Remove it.

Link: https://lore.kernel.org/r/20230710232136.233034-2-helgaas@kernel.org


Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>