lights: fix liblights on GTA04 and Letux3704

Implemented battery and notifications logical LEDs.

Battery on power LED:
  charging: orange (GTA04), green (L3704)
  charged: green (GTA04+L3704)
  not charging: off (GTA04+L3704)

Signed-off-by: Lukas Märdian <lukas@goldelico.com>