The debounce-interval of a gpio-keys node should be placed in the key
node itself, not in the main node. Move the properties added earlier and
fix the key node name while we're here.
Fixes: 4357f32d41 ("realtek: debounce reset key for Zyxel GS1900")
Signed-off-by: Sander Vanheule <sander@svanheule.net>