Add CHERI CSRs and encodings

[tariqkurd-repo]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.83%. Comparing base (d3fcce5) to head (3ac3a8d).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #237   +/-   ##
=======================================
  Coverage   92.83%   92.83%           
=======================================
  Files           3        3           
  Lines         642      642           
=======================================
  Hits          596      596           
  Misses         46       46           

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[tariqkurd-repo]

replaces https://github.com/riscv/riscv-opcodes/pull/214 and add CLIC CSRs

[tariqkurd-repo]

replaced by https://github.com/riscv/riscv-opcodes/pull/328