Expose vfio_pci_core_aer_err_detected() to be used by drivers as part of
their pci_error_handlers structure.

Next patch for mlx5 driver will use it.

Link: https://lore.kernel.org/all/20220224142024.147653-15-yishaih@nvidia.comReviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>