Move all the generic code from the Nuvoton NPCX keyboard scanning driver
into input_kbd_matrix.c. While doing that convert few configs into
devicetree properties and tweak few other things to enable the generic
code to support multiple instances.
This is limited to 8 rows for now, and that's fine for all the current
in-tree drivers, the limit could be removed down the road but this
should be fine for now, added few generic build checks to make sure a
driver does not go over the limit, as well and some more implementation
specific checks.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
9439c816e9