Fix spinalhdl MaskedLiteral

[davine47]

hi,
I have modified the generation of MaskedLiteral in SpinalHDL, please review it.
@Dolu1990

[aswaterman]

I'll wait for @Dolu1990's approval

[Dolu1990]

Hi,

So, basicaly, i wasn't aware of this feature nor this repository XD

The PR look OK for me.

[aswaterman]

@Dolu1990 Haha, yes, long time no see.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.08%. Comparing base (4644ba3) to head (1e70558).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #403   +/-   ##
=======================================
  Coverage   97.08%   97.08%           
=======================================
  Files          14       14           
  Lines         926      926           
=======================================
  Hits          899      899           
  Misses         27       27           

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