chacha20poly1305: remove unused funcs.

[dajiaji]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.29%. Comparing base (99260ad) to head (cc2e6d9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #606      +/-   ##
==========================================
+ Coverage   83.14%   84.29%   +1.14%     
==========================================
  Files          73       72       -1     
  Lines        6415     6285     -130     
  Branches      590      590              
==========================================
- Hits         5334     5298      -36     
+ Misses       1072      978      -94     
  Partials        9        9              

Flag	Coverage Δ
unittests	84.29% <100.00%> (+1.14%)	⬆️

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