dialects: (riscv_snitch) remove always ZERO rd in snitch config ops

[superlopuh]

Resolves #2884

[nazavode]

Neat, thanks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.85%. Comparing base (75b78ec) to head (665a51e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2886      +/-   ##
==========================================
- Coverage   89.85%   89.85%   -0.01%     
==========================================
  Files         399      399              
  Lines       50171    50179       +8     
  Branches     7755     7755              
==========================================
+ Hits        45083    45090       +7     
+ Misses       3860     3859       -1     
- Partials     1228     1230       +2     

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