Move scterm_teken.c from 6 MD files lists to the MI files list so that it
is easier to configure. It is MI, unlike some of the other syscons files
already in the MI list.

Move scvtb.c similarly. It is needed whenever sc is configured, and is
more MI than most of the files already in the MI list.

This only changes the combined list for arm64 and mips. These arches
already cannot build sc or even NOTES.