bcm27xx: update distroconfig.txt for faster RPi4 #4987
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Newer RPi 4 Rev 6 (8 GB models and recent 2 GB / 4 GB models) ship with the so-called C0 processor which can run turbo mode at 1.8 GHz max rather than 1.5 GHz gracefully. Add 'arm_boost=1' to pi4 section of to enable.
Note that this setting has no effect on older chips; they continue with their 1.5 GHz max unless users overclock them.
Ref: https://www.raspberrypi.com/news/bullseye-bonus-1-8ghz-raspberry-pi-4
Signed-off-by: John Audia graysky@archlinux.us