PCI/AER: Keep ANFE masked on Apple T2 Secure Enclave

Commit eddba19b8b5f ("PCI/AER: Support Advisory Non-Fatal Errors")
unmasks Advisory Non-Fatal Errors on devices which support Role-Based
Error Reporting. On a MacBookPro16,1, enabling ANFE on the Apple T2
Secure Enclave Processor [106b:1802] causes spontaneous power loss.

Leave the Secure Enclave's ANFE mask unchanged. Set a per-device flag
with an EARLY fixup, before pci_aer_init() can unmask ANFE; a FINAL fixup
would run too late. Keep the advertised RBER capability and all other
AER initialization and reporting unchanged. Other Apple T2 functions
and non-Apple devices retain the existing ANFE behavior.

Setting the flag repeatedly and skipping the ANFE unmask operation are
idempotent. The underlying device or firmware failure is not understood.

[bhelgaas: Aditya posted essentially the same patch soon after:
https://lore.kernel.org/all/20261010172301.12764-1-aditya.garg@linux.dev]

Fixes: eddba19b8b5f ("PCI/AER: Support Advisory Non-Fatal Errors")
Reported-by: Jason Perlow <jperlow@gmail.com>
Closes: https://lore.kernel.org/linux-pci/CABZrw2HcaOh3DHTJtxU5dXrb3Vg19scr6+qR-xe_+R7rME35_Q@mail.gmail.com/
Assisted-by: LLM
Signed-off-by: Jason Perlow <jperlow@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/CABZrw2H+3yt2Y7xiq6OyAWaJM7P9ox-2nJxoQuJMwoJHLgi+YQ@mail.gmail.com/

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