Non IT8951 screens incompatible with hifi berry

[txoof]

Describe the bug
Boards that use gpiozero are incompatible with HiFiBerry due to a pin conflict on GPIO 24 (pin 18). gpiozero stops all sound output.

To Reproduce
Steps to reproduce the behavior:

1. Start music playing via go-librespot/LMS client
2. Start paperpi
3. music stops

Expected behavior
Paperpi should not stop audio

Hardware

• all non IT8951 screens

Plugin Issues
Impacts librespot and LMS plugins

Additional context
solution is to remap GPIO 24 to any other unused GPIO other than 18-21 (HiFiBerry GPIO pins). This will require patching epdconfig.py in the waveshare library.

[txoof]

The solution looks like either monkey-patching the waveshare epdconfig or rewriting it entirely. This is a pretty difficult fix because simply loading the proper waveshare module for a non-IT8951 screen opens a gpiozro GPIO 24 pin and crashes the HiFiBerry sound output in an irrecoverable way.