retropielcdfirst, retropielcdnext co-opts PWM0 pin for Raspberry Pi Zero 2W

[minkezhang]

This is running on a Raspberry Pi Zero 2W, RetroPie, and GPi Case 2W.

The config.txt is edited per the official display patch.

$ raspi-gpio get 18,19
GPIO 18: level=0 fsel=2 alt=5 func=PWM0
GPIO 19: level=0 fsel=2 alt=5 func=PWM1

Installing retropielcdfirst.sh, retropielcdnext.sh will remove speaker functionality on the GPi Case 2W, which seems to pull on pin 18. Plugging in headphones with the Raspberry Pi installed in the case will result in the right speaker being non-functional.

Are the LCD scripts even necessary here? We would assume once someone puts the Pi into the case, it is very likely they will keep the Pi there; if they were to remove the Pi, it seems very likely they will reflash the SD card anyways.

Removing all references to the LCD scripts in retropie_SafeShutdown_gpi2.py and retropie_install_gpi2.sh works fine.