Fix type from trusty-sdk-go.

[blkt]

Summary

This makes explicit use of a type from Trusty SDK library instead of a hand-rolled one which made migrating files around the SDK library itself harder.

Change Type

• Bug fix (resolves an issue without affecting existing features)
• Feature (adds new functionality without breaking changes)
• Breaking change (may impact existing functionalities or require documentation updates)
• Documentation (updates or additions to documentation)
• Refactoring or test improvements (no bug fixes or new functionality)

Testing

Unit tested.

Review Checklist:

• Reviewed my own code for quality and clarity.
• Added comments to complex or tricky code sections.
• Updated any affected documentation.
• Included tests that validate the fix or feature.
• Checked that related changes are merged.

[coveralls]

coverage: 54.77% (+0.007%) from 54.763%
when pulling 78c54c5 on fix/fix-type-in-trusty-tests
into b96d791 on main.