Add IDL code for fround instruction

[ShashankVM]

This PR adds IDL code for fround instruction in Zfa folder.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.30%. Comparing base (1ff5df5) to head (665f2c6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #896   +/-   ##
=======================================
  Coverage   43.30%   43.30%           
=======================================
  Files          10       10           
  Lines        4787     4787           
  Branches     1298     1298           
=======================================
  Hits         2073     2073           
  Misses       2714     2714           

Flag	Coverage Δ
idlc	43.30% <ø> (ø)

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