[ARM] Simplify or eliminate Common-Type `-ref` files.

It is easy to overlook updating ARM common type `xxx-ref` files. We should look for a way to simplify or eliminate the needs to update these files.

Start by surveying the ARM common-type `xxx-ref` files mentioned in the issue and documenting where they must be updated. Determine whether their update process can be simplified or whether the files can be eliminated; done means the maintenance burden is reduced or removed across the relevant common types.

Written by the indexing model from the issue text.