MLMG: Fix a Few MF Includes

[ax3l]

Summary

Include explicitly used MF types in MLMG headers.

Additional background

• AMReX C++20 in VS2026 #4806 (comment)
• [WIP] CI: Windows MSVC C++17 BLAST-WarpX/warpx#6448

Checklist

The proposed changes:

• fix a bug or incorrect behavior in AMReX
• add new capabilities to AMReX
• changes answers in the test suite to more than roundoff level
• are likely to significantly affect the results of downstream AMReX users
• include documentation in the code and/or rst files, if appropriate

[WeiqunZhang]

This is certainly NOT an issue, unless we are philosophical.

[ax3l]

Oh yes, that is just cleaning and robustness for future refactoring.