Steve Baker 41f941a78e Fix GPIO pull up/down for Pi4B
Based on this raspi-gpio commit[1] the 2711 chip uses a different method
for pull up/down. This change implements that same method.

With this change, wiringPi now works for the Pi4B with the subset of
functionality used by zynthian.

[1] 80fa7d04ea
2019-12-14 20:42:06 +00:00
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