move and rename MNT Reform 2 support utilies, cat manpages into one

Aux/imx8pm and aux/wm8960 had pretty cryptic names and it made
more sense to use a reform/pm and reform/audio naming, accordingly.

Instead of having special mount points /mnt/pm and /mnt/wm8960,
/dev is used directly, removing the need to do any manual work -
stats(1) will continue showing the CPU temperature, and zuke(1)
will still be able to control the volume, etc.

Brightness controls were changed to a better interface -
/dev/light, where each line contains a "a_thing its_light_value".
This way more parts can be controlled. Right now it's only "lcd",
but later it might be "kbd" and "trackball" as well.

Example of lib/profile:

reform/audio
echo master 80 > /dev/volume

reform/pm
echo lcd 100 > /dev/light

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