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)
2 files changed