The atmega328pb has officially named these pins as PE2 and PE3, so use
that naming scheme instead of the previous Klipper invented names.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Create a sample-aliases.cfg with all the aliases that are currently
hardcoded in the klippy.pins.py module.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>