Draft: hi846: add 816x612 full-sensor mode
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an attempt to add the full-sensor mode with 4x binning. shows almost only noise. (TODO spend more time on this)
Fixes: https://source.puri.sm/Librem5/linux-next/-/issues/323
to recap, that's an example script for overwriting a few registers (with only 1 reg/value entry as an example, you can add a whole list, "redo" what the driver does by default and change whatever you want):
#!/bin/bash
path="/sys/kernel/debug/hi846/"
echo 1 > "$path/clear"
# these register values are overwriting the default settings when
# starting to stream
# REG VALUE
echo "0x0902" > "$path/address" && echo "0x4319" > "$path/add_value"
# you can put a reg/value table here