cxl fixes for v6.6-rc3

- Fix multiple scenarios where platform firmware defined regions fail to
  be assembled by the CXL core.

- Fix a spurious driver-load failure on platforms that enable OS native
  AER, but not OS native CXL error handling.

- Fix a regression detecting "poison" commands when "security" commands
  are also defined.

- Fix a cxl_test regression with the move to centralize CXL port
  register enumeration in the CXL core.

- Miscellaneous small fixes and cleanups
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