AVR: Support AVR32EB14/20/28/32. Add support for some recent AVR devices. gcc/ * config/avr/avr-mcus.def: Add avr32eb14, avr32eb20, avr32eb28, avr32eb32. * doc/avr-mmcu.texi: Rebuild. (cherry picked from commit 45f605a74fd7e96294477db064cc58033c3fba49)