[mlir][NFC] Switch dialects with no fold methods to the new fold API

These are the trivial cases which do not require any other code changes.
Changing the default might not have any semantic changes but at least guarantees that no new fold methods may be added to these dialects while migrating.

This commit is also revertible at the end of the migration

Differential Revision: https://reviews.llvm.org/D141489