Update mstateen0 fields

[ved-rivos]

Bit 56 - control access to henvcfgh
Bit 55 - control access to small state added by Priv 1.14
- controls access to srmcfg introduced by Ssqosid
(The bit 56 was initially intended for use by the counter delegation extension but was not pursued/approved.)
riscv/riscv-isa-manual#1147

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (61d2ef4) 92.83% compared to head (ba8c854) 92.83%.
Report is 4 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #218   +/-   ##
=======================================
  Coverage   92.83%   92.83%           
=======================================
  Files           3        3           
  Lines         642      642           
=======================================
  Hits          596      596           
  Misses         46       46           

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