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 78.69%. Comparing base (04875db) to head (a01a05a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2617      +/-   ##
==========================================
- Coverage   78.72%   78.69%   -0.03%     
==========================================
  Files         645      645              
  Lines      111086   111084       -2     
  Branches    15690    15689       -1     
==========================================
- Hits        87453    87419      -34     
- Misses      22941    22973      +32     
  Partials      692      692              

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