dialects (riscv_func): Use assembly format for riscv_func.call operation

[compor]

This PR:

• uses the declarative assembly format for riscv_func.call made possible by functional-type core: add functional-type directive #3517
• removes unused utility methods for generic printing/parsing of the above since there are no users for them as a result of the above

Also discussed in #3618

[superlopuh]

🚀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.47%. Comparing base (e719c7f) to head (ad09a9d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3622      +/-   ##
==========================================
- Coverage   90.48%   90.47%   -0.01%     
==========================================
  Files         472      472              
  Lines       59276    59248      -28     
  Branches     5637     5636       -1     
==========================================
- Hits        53633    53606      -27     
  Misses       4205     4205              
+ Partials     1438     1437       -1     

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[alexarice]

👍