* Move to explicit enable of `ZMK_PM_SOFT_OFF` to turn
on the feature and use the behaviors, which matches
how other features work, and helps with split and
testing schemes.
Initial work on a soft on/off support for ZMK. Triggering soft off
puts the device into deep sleep with only a specific GPIO pin
configured to wake the device, avoiding waking from other key
presses in the matrix like the normal deep sleep.
Co-authored-by: Cem Aksoylar <caksoylar@users.noreply.github.com>