[Bug target/57506] [avr] Some devices are present twice in avr-mcus.def

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57506

--- Comment #3 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Fixed by r200870 (trunk), r200871 (4.8.2).