cxl/pci: Replace host_bridge->native_aer with pcie_aer_is_native()

cxl/pci: Replace host_bridge->native_aer with pcie_aer_is_native()

Use pcie_aer_is_native() to determine the native AER ownership as the
usage of host_bride->native_aer does not cover command line override of
AER ownership.

Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Robert Richter <rrichter@amd.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20230823234305.27333-4-Smita.KoralahalliChannabasappa@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>