[clang] [llvm] [AVR] Add many new AVR MCU model definitions (PR #144229)

[Tom Vijlbrief via llvm-commits]

tomtor wrote:

> LGTM. Thank you for updating the patch!

Thanks! I am now rebuilding after:

`cmake -S llvm -B build -G Ninja`




https://github.com/llvm/llvm-project/pull/144229