* To avoid tons of migration, extra flash writes, etc, we keep
the keymaps and settings using a key position index that's tied
to the stock layout, and at runtime mapping key positions as
needed.
* If using a sideband kscan device to wrap a native kscan device,
ensure the inner kscan device is also wakeup enabled to it can
be waken from a deep sleep state by key press.
* Add keymap API for getting/setting a bindings
in keymap layers.
* Add layer move support via intemediary ordering array.
* Add settings storage for keymap changes.
* Add bindings to allow creating multiple physical layouts that specify
their key's physical attributes, and the matching matrix transform
and dependant kscan to use.
* Synthesize a basic physical layout if none specified, for backwards
compatibility.
* Update matrix transform API to explicitly pass in the selected transform
to the API instead of using a fixed chosen transform.
* Move kscan subscription and handling into the physical layout code, so
that selecting a different physical layout at runtime can also use the
correct kscan instance.
* Add `physical_layouts.dtsi` file to include so you can use the
pre-configured `&key_physical_attrs` for adding you layout keys.
Nicolas Munnich
Peter Johanson
Andrew Kannan
Maxime Vincent