Changes so it works on RPi 3

[zieglerjm]

To get this to work on a RPi 3, I had to remove configure_network, enable_oem and updates to /boot/firmware/usercfg.txt & /boot/firmware/cmdline.txt. I also had to add "hdmi_ignore_edid=0xa5000080" to /boot/firmware/usercfg.txt.

I also was able to boot from a USB SSD drive.

[github-actions]

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