fix: modified API under MSO 2,4,5,6 modules

[u625355]

Modified APIs under MSO 2, 4|5|6 modules.
Added default buffer to SMU 26xx series.

Proposed changes

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• Bug fix (non-breaking change which fixes an issue)
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Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2400d8e) 100.00% compared to head (5c809f3) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #142   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          170       170           
  Lines         3801      3801           
  Branches       657       657           
=========================================
  Hits          3801      3801           

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