Unregister aten_linear

[titaiwangms]

Fix #1819

Instead, we rely on PyTorch decomposition to use aten::addmm (Gemm) for accuracy.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.85%. Comparing base (f5709f0) to head (a4ee8a3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1821      +/-   ##
==========================================
- Coverage   74.88%   74.85%   -0.03%     
==========================================
  Files         248      248              
  Lines       26640    26638       -2     
  Branches     4897     4895       -2     
==========================================
- Hits        19949    19940       -9     
- Misses       5750     5757       +7     
  Partials      941      941              

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[justinchuby]

Thanks!