Add definition of low-priority and high-priority RAS event from AIA

[YenHaoChen]

Add definition of low-priority and high-priority RAS event from AIA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.83%. Comparing base (275f72a) to head (4bb0ff4).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #234   +/-   ##
=======================================
  Coverage   92.83%   92.83%           
=======================================
  Files           3        3           
  Lines         642      642           
=======================================
  Hits          596      596           
  Misses         46       46           

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[aswaterman]

Let's change these to RAS_LOW_PRIO and RAS_HIGH_PRIO. The rationale is that RAS is the important part and priority is the less-important part, so RAS should come first in the name.

[YenHaoChen]

@aswaterman Change the name as suggested