update opcode for zvabd

[Qian Jiayan (keyon1992)]

ARC assigned new opcodes for Zvabd extension, we need to update it.
see riscv/riscv-isa-manual#3279

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.78%. Comparing base (4644ba3) to head (6d2b07a).
⚠️ Report is 22 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #430      +/-   ##
==========================================
- Coverage   97.08%   96.78%   -0.30%     
==========================================
  Files          14       14              
  Lines         926      933       +7     
==========================================
+ Hits          899      903       +4     
- Misses         27       30       +3     

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[Qian Jiayan (keyon1992)]

Andrew Waterman (@aswaterman) Could you please review it