platform/x86: meraki-mx100: Use static device properties

Convert the Meraki MX100 board driver to use software nodes and static
device properties to describe the on-board LEDs and reset button.

This moves away from the legacy gpiod_lookup_table and platform_data
mechanisms, allowing consumer drivers like leds-gpio and gpio-keys
to rely on the unified device properties interface instead of
board-specific data.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://patch.msgid.link/dzecghqrsrbe74akboqih7xculdm53rbhxa7dimt2ysdevyskd@hxhd2j3vnlt5
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: dtor