[AVR] Add many new AVR MCU model definitions (#144229) 1. Added the missing XMEGA2 definition. The avr64 devices use xmega2 which has SPM(X) defined. 2. The avr16/avr32 devices do have SPM and SPMX features, but the current xmega3 definition has not. Xmega3 is also used for modern attiny series which do not have SPM(X), so that is correct. Leave the avr16/avr32 devices unchanged (using xmega3 to be in sync with gcc definitions). Fixes https://github.com/llvm/llvm-project/issues/116116
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