Add support for Arm RAS System Architecture node CPER

[samerhaj]

The DEN0085 - Arm ACPI for the Armv8-A RAS Extension and RAS System Architecture ver 2.0 specification, section 4, defines additional standard CPER records for Arm RAS architecture.

Arm RAS System Architecture node CPER

The new standard CPER definitions should be added to libcper

[mdmillerii]

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