stage2: Default AVR generic cpu to avr2

The avr1 target is a very minimal subset of the AVR ISA, quoting the GCC
manual:

> This ISA is implemented by the minimal AVR core and supported for
> assembler only.

Default to avr2 as GCC and Clang do.
89df41e5d8LemonBoy committed on 4/6/2021, 5:18:11 PM· committed by Andrew Kelleyparent2bfc6d1
1 file changedLine totals unavailable