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 78.91%. Comparing base (483d379) to head (a71851f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2617      +/-   ##
==========================================
+ Coverage   78.89%   78.91%   +0.01%     
==========================================
  Files         677      677              
  Lines      115526   115525       -1     
  Branches    16249    16250       +1     
==========================================
+ Hits        91150    91167      +17     
+ Misses      23579    23560      -19     
- Partials      797      798       +1     

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