PCI/ERR: Recover from RCiEP AER errors

Add support for handling AER errors detected by Root Complex Integrated
Endpoints (RCiEPs).  These errors are signaled to software natively via a
Root Complex Event Collector (RCEC) or non-natively via ACPI APEI if the
platform retains control of AER or uses a non-standard RCEC-like device.

When recovering from RCiEP errors, the Root Error Command and Status
registers are in the AER Capability of an associated RCEC (if any), not in
a Root Port.  In the non-native case, the platform is responsible for those
registers and we can't touch them.

[bhelgaas: commit log, etc]
Co-developed-by: Sean V Kelley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean V Kelley <[email protected]>
Signed-off-by: Qiuxu Zhuo <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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