Update static_digital_output.py to directly configure static digital
pins. There are no other users of "static" pins, so remove that
support from mcu.py, replicape.py, and sx1509.py. This simplifies the
low-level pin handling code.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Move the code for the static_digital_output config section from
chipmisc.py to a new file in the extras/ directory.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>