Adding new AVR parts

Note for developers when adding new parts support for avrdude

The following points need to be taken care, especially when new family of AVR chips are added.

1. avrintel.c needs to be updated by script
2. pickit5_lut_* related files need to be updated by script
3. Python GUI tables may need to be updated by hand

Reference: https://github.com/avrdudes/avrdude/pull/2150