512avx guards

[m271828]

Issues:

Resolves P286194215
Addresses CryptoAlg-2964

Description of changes:

Change prior AVX checks to new style.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.94%. Comparing base (eaaa97b) to head (31a1fc5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2617      +/-   ##
==========================================
- Coverage   78.96%   78.94%   -0.02%     
==========================================
  Files         669      669              
  Lines      114582   114582              
  Branches    16119    16118       -1     
==========================================
- Hits        90475    90457      -18     
- Misses      23326    23344      +18     
  Partials      781      781              

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